Mitsubishi Electric MDU v2 Programming Manual
en
1 KGA120334-C
MELSEC-Q Series Sequencer CC-Link Communication Version
Applicable models
*The 800A Frame circuit breaker includes specifications of 630A rating and 800A rating.
The marks used mean the following.
In the event of incorrect handling, a dangerous situation may arise, a possibility of
being subject to moderate injury or minor injury, or only physical damage may occur.
Always follow instructions.
Please read the instruction manual for MDU breaker and sequencer for proper use safely before use.
MDU Breaker Operation Manual
CC-Link System Master / Local Module User's Manual type QJ61BT11
CC-Link System Master / Local Module User's Manual type QJ61BT11N
*The version of CC-Link is "CC-Link Ver. 1.10".
250A Frame NF250-SEV with MDUNF250-HEV with MDU
400A Frame NF400-SEW with MDUNF400-HEW with MDU
800A Frame* NF800-SEW with MDUNF800-HEW with MDU
Caution
MDU Breaker
Programming Manual
2 KGA120334-C
Introduction
Thank you very much for purchasing our MDU breaker.
Please read this manual before use and fully understand the functions and performance of the MDU breaker
( hereinafter referred to as "MDU") for safe and proper operation.
Table of Contents
1. General Description .............................................................................................................................. 3
2. Overall configuration of the CC-Link system ........................................................................................ 4
3. CC-Link communication specifications of the MDU .............................................................................. 5
4. Establishment of communication between the sequencer CPU and the MDU .................................... 6 4.1 Overview of communication ............................................................................................................. 6 4.2 Parameter setting ............................................................................................................................ 7
4.2.1 Parameter storage area .............................................................................................................. 7 4.2.2 Parameter setting and start of the data link ................................................................................ 7 4.2.3 Setting items of the network parameter ...................................................................................... 8
4.3 Parameter setting by GX Developer ................................................................................................ 9 4.3.1 Setting of the master station network parameter ........................................................................ 9 4.3.2 Master station automatic refresh parameter setting ................................................................. 13
4.4 Data link status check .................................................................................................................... 15 4.4.1 Master station I/O signal check ................................................................................................ 15 4.4.2 Master station link special register check ................................................................................. 16
5. Communication between the sequencer CPU and the MDU ............................................................. 17 5.1 Overview of communication ........................................................................................................... 17 5.2 Remote input and output and remote register of the MDU ............................................................ 18
5.2.1 Remote input (RX) .................................................................................................................... 18 5.2.2 Remote output (RY) .................................................................................................................. 19 5.2.3 Remote register (RWw), remote register (RWr) ....................................................................... 20 5.2.4 Relation with the sequencer CPU devices ............................................................................... 20
5.3 Initial communication ..................................................................................................................... 26 5.4 Normal communication .................................................................................................................. 26 5.5 Error communication ...................................................................................................................... 27
6. Commands supported by the MDU .................................................................................................... 28 6.1 List of commands ........................................................................................................................... 28 6.2 Details of commands ..................................................................................................................... 29
7. Error occurrence ................................................................................................................................. 48
8. Sample program ................................................................................................................................. 49 8.1 Contents of the sample program ................................................................................................... 49 8.2 Device configuration ...................................................................................................................... 49 8.3 Device allocations .......................................................................................................................... 50 8.4 Parameter setting .......................................................................................................................... 51
8.4.1 Network parameter and automatic refresh parameter setting .................................................. 51 8.4.2 Operation setting ...................................................................................................................... 52 8.4.3 Station information setting ........................................................................................................ 52
8.5 Sample program (Circuit form) ...................................................................................................... 53
9. Abbreviations and terms used in this manual ..................................................................................... 58
3 KGA120334-C
1. General Description
The MDU breaker ( hereinafter referred to as "MDU" ) supports also the communication via the Control & Communication
Link ( hereinafter referred to as "CC-Link" ).
In order to monitor the measurement values and breaker information in the MDU or to configure each setting of the MDU
from MELSEC-Q series sequencer ( hereinafter referred to as "Q sequencer" ) with QJ61BT11N type CC-Link system
master local unit or QJ61BT11 type CC-Link system master local unit, users need to create a sequence program
appropriate for the intended purpose.
This manual explains the communication procedures, commands, and response to commands that are necessary when a
user creates a sequence program appropriate for the intended purpose.
This manual is described based on the assumption that SWnD5C-GPPW ( n = 4 or more ) and GX Developer are used.
Before starting actual programming, please read the following reference manuals in addition to this manual.
Table 1.1 Reference manuals
Manual name Manual No.
CC-Link System Master/Local Module User's Manual
type QJ61BT11
SH-080016
(13JL91)
CC-Link System Master/Local Module User's Manual
type QJ61BT11N
SH-080394E
(13JR64)
Instruction Manualf for MDU Breaker Included in the same package with the product
4 KGA120334-C
2. Overall configuration of the CC-Link system
The CC-Link system is currently offered in Ver. 2 and available in four modes depending on various systems. Table 2.1
shows the outline of each mode. In consideration of concurrent existence of the CC-Link system master local units of
QJ61BT11N type and QJ61BT11 type, this programming manual is described based on the assumption of the use of the
CC-Link system master local unit in the "Remote net Ver. 1 mode". The devices of the CC-Link system in the "Remote net
Ver. 1 mode" include the remote I/O station, remote device station, local station, and intelligent device station. Up to total
of 64 remote I/O stations, remote device stations, and local stations can be connected to one master station.
The MDU is a remote device station and a slave station supporting Ver. 1. (It can be connected also to the master local
unit supporting Ver. 2 and used in the remote net Ver. 1 mode, remote net Ver. 2 mode, or remote net add mode).
As the condition for connection in the "Remote net Ver. 1 mode", it is necessary to satisfy the followings.
(1) {(1 x a) + (2 x b) + (3 x c) + (4 x d)} 64 a: Number of units occupying one station (The MDU falls into this category.) b: Number of units occupying two stations c: Number of units occupying three stations d: Number of units occupying four stations
(2) {(16 x A) + (54 x B) + (8C)} 2304
A: Number of remote I/O stations 64 stations
B: Number of remote device stations (The MDU falls into this category.) 42 stations
C: Local station, intelligent device station 26 stations
The diagram below shows the overall system configuration in the "Remote net Ver. 1 mode".
Analog-digital conversion unit AJ65BT-64AD
Remote I/O unit AJ65BTB1-16D AJ65BTC1-32D
RS-232C interface unit AJ65BT-R2
Master station
QJ61BT11N QJ61BT11
Terminating resistor (Required)
A1SJ61QBT11 AJ61QBT11
Local station
QJ61BT11N QJ61BT11
Local station
A1SJ61BT11 AJ61BT11
Local station
Max. 26 units
Intelligent device station
Max. 26 units
Terminating resistor
(Required)
Remote device station
Max. 42 units
Remote I/O station
Max. 64 units
CC-Link dedicated cable
CC-Link dedicated cable
Total number: 64
Fig. 2.1 Overall system configuration
5 KGA120334-C
Table 2.1 List of modes of CC-Link system
Mode Connectable station Overview
Remote net Ver. 1 mode Remote I/O station
Remote device station Intelligent device station
Local station Standby master station
Mode fully compatible with the existing unit (QJ61BT11). This mode is selected when there is no need to increase the number of cyclic units or when the existing unit is replaced with QJ61BT11N as a spare unit.
Remote net Ver. 2 mode This mode is selected when a new system is developed by increasing the number of cyclic units.
Remote net add mode This mode is selected when a slave station supporting Ver. 2 is added to the existing system and the number of cyclic units is increased.
Remote I/O net mode Remote I/O station
This mode is selected in the case of the system configuration comprised only of the master station and remote I/O station. The link scan time can be reduced since cyclic transmission is performed at a high speed.
3. CC-Link communication specifications of the MDU
Table 3.1 shows the CC-Link communication specifications of the MDU.
Table 3.1 CC-Link communication specifications of the MDU
Item Description
Unit type Remote device station
Number of occupied stations One station
Number of connectable units Max. 42 units (When only the remote device station occupying one station is
connected)
Transmission speed Select from 156 kbps, 625 kbps, 2.5 Mbps, 5 Mbps, and 10 Mbps.
Number of remote inputs/outputs 32 points each
Number of remote registers 4 points each
Up to 42 MDUs are connectable. (When only the MDU series is connected)
MDU
MDU
MDU
MDU
MDU
MDU
MDU series system configuration example (CC-Link)
MDU
C C
-L in
k m
a s te
r s ta
ti o
n
6 KGA120334-C
4. Establishment of communication between the sequencer CPU and the MDU
4.1 Overview of communication
When using the attached CC-Link system master local unit, set it as the master station. ( For the details of the setting, see the manual of the CC-Link system master local unit. ) The sequencer CPU and the MDU communicate with each other via the master station. The overview of establishment of the communication is shown below.
Sequencer CPU
MDU (Up to 42)
Network parameter
Network parameter
Master station
Buffer memory
Remote input (RX)
Remote register (RWw)
[2]
Remote input (RX)
Remote register (RWw)
Remote register (RWr)
Bit device
(e.g.: X)
Word device
(e.g.: W)
Word device
(e.g.: W)
Remote output (RY)
MDU: 1st
Remote input (RX)
Remote register (RWw)
Remote register (RWr)
MDU: 42nd
MDU: 1st
MDU: 42nd
Remote output (RY)
.. . [3]
[1]
[2]
MDU: 1st
MDU: 42nd
.. .
.. .
.. .
[2]
Remote output (RY)
[2]
Bit device
(e.g.: Y) [3]
MDU: 1st
MDU: 42nd
.. .
.. . [3]
[2]
[2]
Remote register (RWr)
MDU: 1st
MDU: 42nd
.. .
.. .
[2]
[2]
[3]
Automatic refresh
parameter
1Start of data link : The sequencer CPU transmits a network parameter in the sequencer CPU to the master station
and sets the parameter when the power supply is turned on or reset. The master station
automatically starts data link with each connected MDU according to the parameter setting and
starts up the CC-Link system automatically.
2Link scan : The master station automatically and regularly reads the remote input (RX) and remote register
(RWr) of each data-linked MDU in succession, stores them in the buffer memory, and write the
remote output (RY) and remote register (RWw) stored in the buffer memory to each MDU.
3Matic refresh : The sequencer CPU automatically and regularly writes and updates the data of each device of
the sequencer CPU in the remote output (RY) and remote register (RWw) in the buffer memory
of the master station, reads data from the remote input (RX) and remote register (RWr) in the
buffer memory of the master station, stores the data in each device in the sequencer CPU, and
updates (= refreshes) the data of the MDU.
7 KGA120334-C
4.2 Parameter setting
This section explains the parameter setting necessary for the establishment of communication between the sequencer
CPU and the MDU.
4.2.1 Parameter storage area This section explains the relation between the parameter area of the sequencer CPU and the parameter memory of the
master station.
(1) Parameter area of the sequencer CPU
This is an area where the basic values to control the sequencer system is set. The network parameter to control the
CC-Link system and the automatic refresh parameter are also set in this area.
(2) Parameter memory of the master station
This is an area where the network parameter of the CC-Link system is stored.
When the power supply of the unit is turned off or the sequencer CPU is reset, the network parameter disappears.
However, every time the power supply is turned on or the sequencer CPU is reset, the network parameter is set
from the sequencer CPU.
Sequencer CPU
Master station
CC-Link system network parameter
area
CC-Link system network parameter
area
Power ON
CPU reset
Parameter area
Parameter memory
Automatic refresh parameter area
4.2.2 Parameter setting and start of the data link
The setting of the network parameter for starting the data link and the setting of the automatic refresh parameter for
executing the automatic refresh are made from GX Developer. The figure below shows the procedure from the parameter
setting by GX Developer to the start of the data link.
Master station
Using GX Developer, the
network parameter and the
automatic refresh parameter
are created and written in the
sequencer CPU.
Network parameter
Sequencer CPU
Automatic refresh
parameter
Network parameter
Network parameter
Automatic refresh
parameter
GX Developer
Parameter memory
Master station
When the sequencer system
is powered ON or the
sequencer CPU is reset, the
network parameter in the
sequencer CPU is transferred
to the master station and the
data link automatically starts.
Network parameter
Sequencer CPU
Automatic refresh
parameter
Network parameter
Network parameter
Automatic refresh
parameter
GX Developer
Parameter memory
CC-Link system parameter area
CC-Link system parameter area
NoteThe parameter setting by GX Developer has the following characteristics.
Necessity of the
program for setting
the parameter
Automatic
refresh
Number of
attachable
units
Parameter change while
the sequencer CPU is
running
Setting by GX Developer Not necessary 4 x
8 KGA120334-C
4.2.3 Setting items of the network parameter
The following table lists the items of the network parameter stored in the parameter memory of the master station.
Table 4.2.3
Setting item Description
Setting of data link error station
Set the input data status from the station having a data link error.
Default valueClear
Setting rangeHold, clear
Setting when the CPU is stopped
Select whether to refresh or forcibly clear the slave station when the sequencer CPU is stopped.
Default valueRefresh
Setting rangeRefresh, forcibly clear
Number of connected units
Set the number of remote stations, local stations, intelligent device stations, and standby master stations connected to the master station (including the reserve station).
Default value64 ( stations )
Setting range1 - 64 ( station(s) )
Number of retries
Set the number of retries of the communication to the station having an error.
Default value3 ( times )
Setting range1 - 7 ( time(s) )
Number of automatically restored units
Set the number of remote stations, local stations, intelligent device stations, and standby master stations that can be restored by one link scan.
Default value1 ( station )
Setting range1 - 10 ( station(s) )
Standby master station specification
Specify the station number of the standby master station.
Default value0 ( 0The standby master station is not specified. )
Setting range0 - 64 ( 0The standby master station is not specified. )
CPU shut down specification
Specify the data link status when a failure occurs in the master station sequencer CPU.
Default value0 ( Stop )
Setting range0 ( Stop ), 1 ( Continue )
Scan mode specification
Specify the synchronization or non-synchronization of the link scan for the sequence scan.
Default value0 ( Non-synchronize )
Setting range0 ( Non-synchronize ), 1 ( Synchronize )
Delay time setting
Specify the interval of the link scan. (Unit: 50 s)
Default value0 (0: Not specified)
Setting range0 - 100 (0: Not specified)
* Actual link scan interval = Setting value x 50 s
Reserve station specification
Specify the reserve station.
Default value 0 ( Not specified )
Setting rangeTurn on the bit corresponding to the station number.
Error invalid station specification
Specify the error invalid station.
Default value0 ( Not specified )
Setting rangeTurn on the bit corresponding to the station number.
Station information
Set the type of the connected remote station, local station, intelligent device station, and standby master station.
Default valueRemote I/O station supporting Ver. 1, one occupied
station, station No. 1 - Remote I/O station supporting Ver. 1, one occupied station, station No. 64
Setting range
Station typeRemote I/O station, remote device station, and intelligent
device station /Ver. 1 and Ver. 2 ( Set as 1, 2, 4, and 8 times )
Number of occupied stationsOne occupied station, two occupied
stations, three occupied stations, and four occupied stations
Station number1 - 64
NoteThe MDU is a remote device station occupying one station.
9 KGA120334-C
4.3 Parameter setting by GX Developer
This section explains the parameter setting using GX Developer. In the parameter setting using GX Developer, the master
station network parameter and automatic refresh parameter are set.
For the detailed information on the operation of GX Developer, see the operating manual of GX Developer.
The following shows a system configuration example.
Master station (X00 - X1F) (Y00 - Y1F)
1st MDU (One occupied
station)
Station No. 1
2nd MDU (One occupied
station)
Station No. 2
4.3.1 Setting of the master station network parameter (1) The following shows an example of the setting. See (2) for the actual setting.
2
5
1
10
(2) Set the network parameter in the following procedure.
(a) Set the "Number of units" for which the network parameter is set.
Do not include the unit whose parameter is set by the dedicated instruction ( RLPASET instruction ) in the
"Number of units".
Default value: None
Setting range: 0 - 4 ( unit(s) )
Example Set it to 1 ( unit ).
10 KGA120334-C
(b) Set the "First I/O No." of the master station.
Default value: None
Setting range: 0000 - 0FE0
Example Set it to 0000.
(c) Set the parameter name in the "Operation setting".
Even if the parameter name is not set, it does not affect the operation of the CC-Link system.
Default value: None
Setting range: Single-byte, eight characters or less
Example Set it to "SAMPLE".
(d) Set the input status of the data link error station in the "Operation setting".
Default value: Clear ( No tick mark in "Hold the input data" )
Setting range: Hold ( Tick mark in "Hold the input data" )
Clear ( No tick mark in "Hold the input data" )
Example Set it to Clear ( Put no tick mark in "Hold the input data" ).
11 KGA120334-C
(e) Set whether to refresh or forcibly clear the slave station when the sequencer CPU is stopped in the "Operation
setting".
Default value: Refresh ( No tick mark in "Forced clear" )
Setting range: Refresh ( No tick mark in "Forced clear" )
Forced clear ( Tick mark in "Forced clear" )
Example Set it to Refresh ( Put no tick mark in "Forced clear" ).
(f) Set the type of the station in "Type".
Default value: Master station
Setting range: Master station, master station ( supporting the duplication function ), local station, standby
master station
Example Set it to Master station.
(g) Set the mode of CC-Link in the "Mode setting".
Default value: Remote net - Ver. 1 mode
Setting range: Remote net - Ver. 1 mode, remote net - Ver. 2 mode,
remote net - add mode, remote I/O net mode, off line
Example Set it to Remote net - Ver. 1 mode.
(h) Set the total number of units connected on the CC-Link system including the reserve station in the "Total number
of connected units".
Default value: 64 ( units )
Setting range: 1 - 64 ( unit (s) )
Example Set it to 2 ( units ).
(i) Set the number of retries in the event of a communication error in the "Number of retries ".
Default value: 3 ( times )
Setting range: 1 - 7 ( time(s) )
Example Set it to 5 ( times ).
(j) Set the number of units that can be restored by one link scan in the "Number of automatically restored units".
Default value: 1 ( unit )
Setting range: 1 - 10 ( unit (s) )
Example Set it to 1 ( units ).
12 KGA120334-C
(k) Set the station number of the standby master station in the "Standby master station number".
Default value: Blank ( Standby master station not specified )
Setting range: Blank, 1 - 64 ( Standby master station not specified )
Example Set it to Blank ( Standby master station not specified ).
(l) Set the data link status when an error occurs in the master station sequencer CPU in the "CPU shutdown
specification".
Default value: Stop
Setting range: Stop, continue
Example Set it to Stop.
(m) Set whether or not to synchronize the link scan with the sequence scan in the "Scan mode specification".
Default value: Not synchronize
Setting range: Synchronize, not synchronize
Example Set it to Not synchronize.
(n) Set the link scan interval in the "Delay time setting".
Default value: 0 ( Not specified )
Setting range: 0 - 100 ( Unit: 50 s )
Example Set it to 10 ( 500 s ).
(o) Set the station information in the "Station information setting".
Default value: Remote I/O station, one time setting, one occupied station, 32 points, reserve station/error
invalid station not specified
Setting range Station type: Not specified, remote I/O station, remote device station, intelligent device station
( including local station and standby master station )
Extended cyclic setting ( Not changeable ):
One time setting
Number of occupied stations: Not specified, one occupied station, two occupied stations, three
occupied stations, four occupied stations
Number of remote stations ( Not changeable ):
32 points [ in the case of one occupied station ], 64 points [ in the case of two
occupied stations ], 96 points [ in the case of one occupied station ], 128 points
[ in the case of one occupied station ]
Reserve/invalid station specification:
Not specified, reserve station, invalid station ( error invalid station )
Intelligent buffer specification ( word ):
Not specified, send 0, 64-4096, receive 0, 64-4096, automatic 0, 64-4096
Example Set the station information according to the system configuration described in 4.3.
Since the MDU is a remote device station occupying one station, configure the setting as follows.
13 KGA120334-C
4.3.2 Master station automatic refresh parameter setting
(1) The following shows an example of the setting. See (2) for the actual setting.
2
X1000
Y1000
W0
W100
SB0
SW0
5
1
10
(2) Set the automatic refresh parameter in the following procedure.
(a) Set the refresh device of remote input (RX) in the "Remote input (RX) refresh device".
Default value: None
Setting range: Device name - Select from X, M, L, B, D, W, R, and ZR.
Device number - Select from within the range of number of device points possessed by the
sequencer CPU
Example Set it to X1000.
(b) Set the refresh device of remote output (RY) in the "Remote output (RY) refresh device".
Default value: None
Setting range: Device name - Select from Y, M, L, B, T, C, ST, D, W, R, and ZR.
Device number - Select from within the range of number of device points possessed by the
sequencer CPU
Example Set it to Y1000.
(c) Set the refresh device of remote register (RWr) in the "Remote register (RWr) refresh device".
Default value: None
Setting range: Device name - Select from M, L, B, D, W, R, and ZR.
Device number - Select from within the range of number of device points possessed by the
sequencer CPU
Example Set it to W0.
14 KGA120334-C
(d) Set the refresh device of remote register (RWw) in the "Remote register (RWw) refresh device".
Default value: None
Setting range: Device name - Select from M, L, B, T, C, ST, D, W, R, and ZR
Device number - Select from within the range of number of device points possessed by the
sequencer CPU
Example Set it to W100.
(e) Set the refresh device of the special relay (SB) in the "Special relay (SB) refresh device".
Default value: None
Setting range: Device name - Select from M, L, B, D, W, R, SB, and ZR.
Device number - Select from within the range of number of device points possessed by the
sequencer CPU
Example Set it to SB0.
(f) Set the refresh device of the special register (SW) in the "Special register (SW) refresh device".
Default value: None
Setting range: Device name - Select from M, L, B, D, W, R, SW, and ZR.
Device number - Select from within the range of number of device points possessed by the
sequencer CPU
Example Set it to SW0.
When you set X, Y, B, W, SB, or SW to the refresh device, avoid using the device numbers already used for
other network, etc.
Point
15 KGA120334-C
4.4 Data link status check
4.4.1 Master station I/O signal check
The data link status of the master station itself and the MDU connected to the master station can be checked by the
status of the input signal status of the master station. The following table lists the I/O signals of the master station (= CC-
Link system master local unit).
Table 4.4.1 List of I/O signals of master station
Signal direction: Sequencer CPU <= Master station Signal direction: Sequencer CPU =>
Master station
Input number (Note 1)
Signal name Description Output number
(Note 1) Signal name Description
Xn0 Unit error ON: Error, OFF: Normal (Note 2) Yn0
Use prohibited
Xn1 Own station data link
status ON: During data link, OFF: During stop Yn1
Xn2 Use prohibited Yn2
Xn3 Other station data link
status ON: Error station exists, OFF: All stations
are normal (Note 3) Yn3
Xn4 Yn4
Xn5 Yn5
Xn6 Yn6
Xn7 Yn7
Xn8 Yn8
Xn9 Use prohibited Yn9
XnA YnA
XnB YnB
XnC YnC
XnD YnD
XnE YnE
XnF Unit ready ON: Enable, OFF: Disable (Note 4) YnF
X(n+1)0
Use prohibited
Y(n+1)0
X(n+1)1 Y(n+1)1
X(n+1)2 Y(n+1)2
X(n+1)3 Y(n+1)3
X(n+1)4 Y(n+1)4
X(n+1)5 Y(n+1)5
X(n+1)6 Y(n+1)6
X(n+1)7 Y(n+1)7
X(n+1)8 Y(n+1)8
X(n+1)9 Y(n+1)9
X(n+1)A Y(n+1)A
X(n+1)B Y(n+1)B
X(n+1)C Y(n+1)C
X(n+1)D Y(n+1)D
X(n+1)E Y(n+1)E
X(n+1)F Y(n+1)F
Note 1: "n" in the table is determined by the first I/O number (= determined by the attached position of the master station and the unit attached preceding the master station) of the master station (= CC-Link system master local unit). When the first I/O number of the master station is "X/Y30", Xn0 - X(n+1)F => X30 - X4F, Yn0 - Y(n+1)F => Y30 - Y4F.
Note 2: When unit error (Xn0) is ON, unit ready (XnF) turns OFF. Note 3: This signal has the same contents as those of the link special relay SB0080 of the master station.
The status of each station is stored in the link special register SW0080 - SW0083 of the master station. Note 4: Immediately after the power supply is turned on, the signal turns off. When the unit becomes operable,
the signal automatically turns ON. When there is an error in the switch setting of the unit or when unit error (Xn0) is ON, the signal turns OFF.
Users cannot use the output signals described as use prohibited since they are used by the system. If such
signals are used ( turned on/off ), the normal operation is not guaranteed.
Point
16 KGA120334-C
4.4.2 Master station link special register check The data link status of each MDU connected to the master station can be checked by the status of each bit of the link
special register SW0080 to SW0083 of the master station.
Register No.
b15
b14
b13
b12
-
b3
b2
b1
b0
Master station buffer memory address
SW0080 16 15 14 13 - 4 3 2 1 680h SW0081 32 31 30 29 - 20 19 18 17 681h SW0082 48 47 46 45 - 36 35 34 33 682h SW0083 64 63 62 61 - 52 51 50 49 683h
In the table, 1 to 64 indicate station numbers. The data link status of each station number is stored in each bit. When the bit value is 0, the data link is normal. When the bit value is 1, the data link has an error.
In the case that special link register SW0 in the sequencer CPU is set in the special register (SW) refresh device as
shown in the example described in "4.3.2 Master Station automatic refresh parameter setting", the contents shown in the
table above is stored in SW0080 - SW0083 in the sequencer CPU by the automatic refreshing. Therefore, the data link
status of each MDU connected to the master station can also be checked by each bit of SW0080 - SW0083 in the
sequencer CPU.
17 KGA120334-C
5. Communication between the sequencer CPU and the MDU
5.1 Overview of communication In the communication between the sequencer CPU and the MDU, there are three communication statuses including
initial communication, normal communication, and error communication.
In the normal communication, the following setting is possible:
Monitoring of ON/OFF information (bit data) of an alarm (PAL, etc.) and a cause for interruption (LTD, STD/INST, etc.)
Monitoring of measurement value of the electric current, voltage, and electric energy (word data) Setting of the values of the demand time delay and time data (word data)
In the MDU, dedicated commands are provided for each measurement and setting item. It becomes possible to monitor
each measurement value and to set values by writing a command assigned to an item to be monitored or to be set as
well as the data associated with it to each device of the sequencer CPU set in the automatic refresh parameter.
Sequencer CPU
[8]
Command/data
Remote register (RWw)
Remote register (RWr)
[1] By the automatic refresh, commands and the associated data stored in the word device of the sequencer CPU
are stored in the remote register (RWw) of the master station.
[2] By the link scan, commands and the associated data stored in the remote register (RWw) of the master station
are sent to the MDU and stored in the remote register (RWw) of the MDU.
[3] By the automatic refresh, the command execution request stored in the bit device of the sequencer CPU is
stored in the remote output (RY) of the master station.
[4] By the link scan, the command execution request stored in the remote output (RY) of the master station is sent
to the MDU and stored in the remote output (RY) of the MDU. Then, the MDU executes the command
according to the command and the associated data.
[5] By the link scan, the command completion reply stored in the remote output (RY) of the MDU is sent to the
mater station and stored in the remote output (RY) of the master station.
[6] By the automatic refresh, the command completion reply stored in the remote input (RX) of the master station is
stored in the bit device of the sequencer CPU.
[7] By the link scan, the reply data for the command stored in the remote register (RWr) of the MDU is sent to the
master station and stored in the remote register (RWr) of the master station.
[8] By the automatic refresh, the reply data for the command stored in the remote register (RWr) of the master
station is stored in the word device of the sequencer CPU.
Outline of command sending/receipt to/from the MDU
Command/data
Remote register (RWw)
Reply data for
command
Remote register (RWr)
Master station
MDU
[7]
Reply data for
command
Reply data for
command
Command/data
Word device (e.g.: W)
Word device (e.g.: W)
[1]
[2]
Command execution request
Bit device (e.g.: Y)
Remote output (RY)
Command completion reply
Bit device (e.g.: X)
Command completion reply
Command completion reply
Command execution request
Command execution request
Remote output (RY)
Remote input (RX)
Remote input (RX)
A u
to m
a ti c r
e fr
e s h
L in
k S
c a n
[4]
[5]
[6]
[3]
C o
m m
a n
d e
x e
c u
ti o
n
18 KGA120334-C
5.2 Remote input and output and remote register of the MDU
The remote input (RX) and remote output (RY) are used when the bit data is communicated between the sequencer
CPU and the MDU. The remote register (RWw) and remote register (RWr) are used when the word data is
communicated between the sequencer CPU and the MDU.
5.2.1 Remote input (RX) Since the MDU is a remote device station occupying one station, it has 32 points of the remote input (RX).
The following table lists the allocation of the remote input (RX) of the MDU.
"n" of the device No. in the table below can be obtained by converting the calculation result of "(Station number -1) x 2"
into the hexadecimal number.
Example When the station number of the MDU is 41, "(41 - 1) x 2 = 80". When this calculation result is converted into
the hexadecimal number, the result is "50". Therefore, RXn0 - RX (n+1) F indicates RX500 - RX51F.
Remote input (RX) device No.
Signal name
Description
Remark Inside the master station
Inside the MDU
OFF (0) ON (1)
RXn0 RX00 AX (on/off status) OFF or trip ON Note 1
RXn1 RX01 AL (Trip status) OFF or ON Trip Note 2
RXn2 RX02 PAL (Pre-alarm) No alarm occurred Alarm occurred Note 5
RXn3 RX03 Unusable - -
RXn4 RX04 Unusable - -
RXn5 RX05 Unusable - -
RXn6 RX06 LTD Not occurred Occurred Note 3, 6
RXn7 RX07 STD/INST Not occurred Occurred Note 3, 4, 6
RXn8 RX08 Lower limit alarm Not occurred Occurred Note 5
RXn9 RX09 Upper limit alarm Not occurred Occurred Note 5
RXnA RX0A IDM _ AL (Current demand alarm) Not occurred Occurred Note 5
RXnB RX0B IUB _ AL (Current unbalanced alarm) Not occurred Occurred Note 5
RXnC RX0C OVER (Overcurrent alarm) No alarm occurred Alarm occurred Note 5
RXnD RX0D ILA _ AL (Current open-phase alarm) Not occurred Occurred Note 5
RXnE RX0E Unusable - -
RXnF RX0F Command completion reply flag No reply data received Reply data received Note 7
RX(n+1)0 RX10 Unusable - -
RX(n+1)1 RX11 Unusable - -
RX(n+1)2 RX12 Unusable - -
RX(n+1)3 RX13 Unusable - -
RX(n+1)4 RX14 Unusable - -
RX(n+1)5 RX15 Unusable - -
RX(n+1)6 RX16 Unusable - -
RX(n+1)7 RX17 Unusable - -
RX(n+1)8 RX18 Initial data processing request flag POWER OFF, remote READY ON,
or error staus flag is ON Power supply is turned
ON or reset Note 7
RX(n+1)9 RX19 Unusable - -
RX(n+1)A RX1A Error flag No error occurred Error occurred Note 7
RX(n+1)B RX1B Remote ready Command sending disabled
Normal communication status
(Command sending enabled)
Note 7
RX(n+1)C RX1C Unusable - -
RX(n+1)D RX1D Unusable - -
RX(n+1)E RX1E Unusable - -
RX(n+1)F RX1F Unusable - -
Note 1: This becomes available when the AX switch for transmission with MDU breaker (optional) is attached to the MDU breaker.
Note 2: This becomes available when the AL switch for transmission with MDU breaker (optional) is attached to the MDU breaker.
AL (Trip status) shows the status of the main body mechanism of the MDU breaker. Note 3: Any one of the causes of the fault is regarded as "Occurred". Note 4: The causes of the fault by INST becomes available when the AL switch for transmission with MDU breaker
(optional) is attached to the MDU breaker. Note 5: The reset method of PAL (self-retention or automatic reset) is set by the data set (2h) of the intermodel
standard command. (See page 40.) The reset method of OVER (overcurrent alarm) is "automatic reset" regardless of the setting. Note 6: The reset of LTD, STD/INST, and respective upper/lower limit alarm are set in the data set (2h) of the
intermodel standard command. (See page 40.) Note 7: For the details, see "5.3 Initial communication", "5.4 Normal communication", and "5.5 Error communication".
19 KGA120334-C
5.2.2 Remote output (RY) Since the MDU is a remote device station occupying one station, it has 32 points of the remote output (RY).
The following table lists the allocation of the remote outputs (RY) of the MDU.
"n" of the device No. in the table below can be obtained by converting the calculation result of "(Station number -1) x 2"
into the hexadecimal number.
Example When the station number of the MDU is 42, "(42 - 1) x 2 = 82". When this calculation result is converted into
the hexadecimal number, the result is "52".
Therefore, RYn0 - RY (n+1) F => RY520 - RY53F.
Remote output (RY) device No.
Signal name
Description
Remark Inside the master station
Inside the MDU
ON (1) OFF (0) OFF (0) ON (1)
RYn0 RY00 Unusable - -
RYn1 RY01 Unusable - -
RYn2 RY02 Unusable - -
RYn3 RY03 Unusable - -
RYn4 RY04 Unusable - -
RYn5 RY05 Unusable - -
RYn6 RY06 Unusable - -
RYn7 RY07 Unusable - -
RYn8 RY08 Unusable - -
RYn9 RY09 Unusable - -
RYnA RY0A Unusable - -
RYnB RY0B Unusable - -
RYnC RY0C Unusable - -
RYnD RY0D Unusable - -
RYnE RY0E Unusable - -
RYnF RY0F Command execution
request flag
When the command execution request is
cancelled
When the command execution is requested
Note 1
RY(n+1)0 RY10 Unusable - -
RY(n+1)1 RY11 Unusable - -
RY(n+1)2 RY12 Unusable - -
RY(n+1)3 RY13 Unusable - -
RY(n+1)4 RY14 Unusable - -
RY(n+1)5 RY15 Unusable - -
RY(n+1)6 RY16 Unusable - -
RY(n+1)7 RY17 Unusable - -
RY(n+1)8 RY18 Initial data processing
completion flag
When the remote ready request is
cancelled
When the remote ready is requested
Note 1
RY(n+1)9 RY19 Unusable - -
RY(n+1)A RY1A Error reset request flag When the error status
reset request is cancelled
When the error status reset is requested
Note 1
RY(n+1)B RY1B Unusable - -
RY(n+1)C RY1C Unusable - -
RY(n+1)D RY1D Unusable - -
RY(n+1)E RY1E Unusable - -
RY(n+1)F RY1F Unusable - -
Note 1: For the details, see "5.3 Initial communication", "5.4 Normal communication", and "5.5 Error communication".
When an unusable device is turned ON or OFF in the sequence program, we will not guarantee the MDU
functions.
Point
20 KGA120334-C
5.2.3 Remote register (RWw), remote register (RWr)
Since the MDU is a remote device station occupying one station, it has the remote registers (RWw) and remote registers
(RWr) of four words respectively as shown below.
"m" of the address shown in the table below can be obtained by converting the calculation result of "(Station number -1) x 4"
into the hexadecimal number.
"n" of the address shown in the table below can be obtained by converting the calculation result of "(Station number -1) x 4"
into the hexadecimal number.
Example When the station number of the MDU is 42, "(42-1) x 4 = 164". When this calculation result is converted into
the hexadecimal number, the result is "A4".
Therefore, RWwm - RWw (m+3) => RWwA4 RWwAF, and RWrn RWr (n+3) => RWrA4 - RWrAF.
Remote register (RWw) Remote register (RWr)
Address Address
Inside the
MDU
Inside the
master station
b15 b0
Inside the
MDU
Inside the
master station
b15 b0
RWw0 RWwm RWr0