Contents

REVISIONS
INTRODUCTION
CONTENTS
1. PC CPU
- 1.1 Configuration of a PC CPU
- 1.2 Devices
  - 1.2.1 Input/output X and Y
  - 1.2.2 Internal relay M and latch relay L
  - 1.2.3 Link relay B
  - 1.2.4 Annunciator F
  - 1.2.5 Timer T
  - 1.2.6 Counter C
  - 1.2.7 Data register D
  - 1.2.8 Link register W
  - 1.2.9 File register R
  - 1.2.10 Accumulator A
  - 1.2.11 Index registers Z and V
  - 1.2.12 Nesting N
  - 1.2.13 Pointer P
  - 1.2.14 Interrupt pointer I
- 1.3 Parameter Setting
2. ALLOCATION OF I/O NUMBERS
- 2.1 I/O Numbers of a Compact Type A0J2 and A0J2H
- 2.2 A2CCPU I/O Allocations
- 2.3 I/O Numbers of a Building Block Type CPU
  - 2.3.1 When only a 16-point module is used
  - 2.3.2 When 32-point and 64-point modules are used
  - 2.3.3 I/O allocation by using parameter setting
3. INSTALLATION ENVIRONMENT
- 3.1 installation Environment
- 3.2 Electronic Environment
4. HANDLING AND MOUNTING
- 4.1 Handling
- 4.2 PC Installation
  - 4.2.1 Mounting instructions
  - 4.2.2 Installating the A0J2,A0J2HCPU
  - 4.2.3 Installation The A2CCPU
  - 4.2.4 Installation The A1SCPU
  - 4.2.5 Installation the A1,A2 and A3 type CPUs
5. WIRING AND GROUNDING
- 5.1 Wiring to base Units
- 5.2 Wiring Instructions
- 5.3 Grounding
6. COUNTERMEASURES AGAINST NOISE
- 6.1 Common Mode Noise and Normal Mode Noise
- 6.2 Power Supply
- 6.3 Grounding
- 6.4 PC Panels
- 6.5 External I/O Signal wire
- 6.6 Troubleshooting and Noise Countermeasures
7. TEST OPERATION AND ADJUSTING
- 7.1 Check Points Before Start of Test Operation
- 7.2 Test Operation and Adjusing Procedure
8. MAINTENANCE
- 8.1 Malfunction Analysis
- 8.2 Maintenance
- 8.3 Expendable Items
- 8.4 Output Relay Lifetimes
- 8.5 Replacement Parts
- 8.6 Program Storage
9. BATTERIES AND FUSES
- 9.1 Battery Lifetimes
- 9.2 Fuses
10. POWER SUPPLY MODULE SELECTION
- 10.1 Selecting an Extension Power Supply Module for an A0J2 or A0J2H CPU
- 10.2 Selection of a Power Supply Module for an A1S
- 10.3 Selection of an Extension Power Supply Module for an A2CCPU
- 10.4 Selestion of a Power Supply Module for an A1,A2, and A3 Type CPU
APPENDIX
- APPENDIX 1 MELSEC-A QC Process Chart
TROUBLESHOOTING
CONTENTS
1. GENERAL INFOMATION ABOUT A-SERIES SYSTEM
- 1.1 Basic Troubleshooting
- 1.2 Troubleshooting
  - 1.2.1 Troubleshooting flow chart
  - 1.2.2 Flow chart used when the "POWER" LED has turned off
  - 1.2.3 Flow chart used when the "RUN" LED has turned off
  - 1.2.4 Flow chart used when the "RUN" LED flickers
  - 1.2.5 Flow chart used when "ERROR" LED has turned on (only A1 and A2 CPUs)
  - 1.2.6 I/O module troubleshooting
  - 1.2.7 Flow chart used when a program cannot be written to the programmable controller
- 1.3 Error Codes
  - 1.3.1 How to read error codes
  - 1.3.2 Error code list
  - 1.3.3 Self-diagnosis
  - 1.3.4 Judging the quality of a CPU
  - 1.3.5 Special relay M
  - 1.3.6 Special register D
- 1.4 I/O Connection Troubleshooting
  - 1.4.1 Input circuit troubleshooting
  - 1.4.2 Output circuit failures and corrective actions
2. COMMONITEMS OF SPECIAL-FUNCTION MODULES
- 2.1 Special-Function Modules
- 2.2 Relationship Between PC CPUs and Special-Function Modules
- 2.3 Buffer Monitoring and Forcible Changing of Current Values by Using Peripheral Devices
3. A-D,D-A CONVERSION MODULES
- 3.1 A0J2-68AD,A68AD Analog-to-Digital Conversion Module
  - 3.1.1 Write date error code list
  - 3.1.2 Troubleshooting flow chart
  - 3.1.3 Flow chart used when "RUN" LED has flickered
  - 3.1.4 Flow chart used when "RUN" LED has turned off
  - 3.1.5 Flow chart used when digital output value cannot be read
  - 3.1.6 Flow chart used when data,such as the number of channels,cannot be written
- 3.2 A68ADC Analog-to-Digital Conversion Unit
  - 3.2.1 Error code list
  - 3.2.2 When the RUN LED flickers or turned OFF
  - 3.2.3 When the LINK RUN LED turned OFF or the LINK ERR. LED turned ON
  - 3.2.4 When read of digital output values is impossible
- 3.3 A1S64AD Analog-to-Digital Conversion Module
  - 3.3.1 Error code list
  - 3.3.2 Troubleshooting
- 3.4 Nomenclature
  - 3.4.1 A68AD
  - 3.4.2 A0J2-68AD
  - 3.4.3 A68ADC
  - 3.4.4 A1S64AD
- 3.5 Performance Specifications
  - 3.5.1 A68AD
  - 3.5.2 A0J2-68AD
  - 3.5.3 A68ADC
  - 3.5.4 A1S64AD
- 3.6 Wiring Instructions
- 3.7 Unit Connection Example
- 3.8 A0J2-A62DA and A62DA Digital-to-Analog Conversion Modules
  - 3.8.1 Troubleshooting flow chart
  - 3.8.2 Flow chart used when "RUN" LED has flickered or turned off
  - 3.8.3 Flow chart used when analog output is not provided property
- 3.9 A64DAVC/DAIC Digital-to-Analog Conversion Unit
  - 3.9.1 Error code list
  - 3.9.2 When the Run LED flickers or turned OFF
  - 3.9.3 When the LINK RUN LED turned OFF or the LINK ERR. LED turned ON
  - 3.9.4 when analog output is not provided correctly
- 3.10 A1S62DA Degital-to-Analog Conversion Module
  - 3.10.1 When the RUN LED flashes or goes OFF
  - 3.10.2 When the analog value is 0 V/0 mA
  - 3.10.3 when analog values are offset values
  - 3.10.4 Analog values are output although the CPU module is set to STOP
  - 3.10.5 When analog values output although the output enable flag(Y10 and Y11) is reset
  - 3.10.6 When digital and analog values do not match
  - 3.10.7 WDT error flag(X0) is set
  - 3.10.8 D-A conversion READY flag(X1) is reset
  - 3.10.9 Error flag(X2) is set
- 3.11 Nomenclature
  - 3.11.1 A62DA
  - 3.11.2 A0J2-62DA
  - 3.11.3 A64DAVC/DAIC
  - 3.11.4 A1S62DA
- 3.12 Performance Specifications
  - 3.12.1 A62DA
  - 3.12.2 A0J2-62DA
  - 3.12.3 A64DAVC
  - 3.12.4 A64DAIC
  - 3.12.5 A1S62DA
- 3.13 Wiring Instructions
- 3.14 Module Connection Example
4. HIGH-SPEED COUNTER MODULES
- 4.1 A0J2-D61,AD61,and AD61-S1 High-Speed Counter Modules
  - 4.1.1 High-speed counter module dose not count
  - 4.1.2 Counter value is incorrect
- 4.2 AD61C High-Speed Counter Unit
  - 4.2.1 Error code list
  - 4.2.2 RUN LED is flickering/OFF
  - 4.2.3 LINK RUN LED is OFF
  - 4.2.4 LINK ERR. LED is ON
  - 4.2.5 Count operations do not execute
  - 4.2.6 Count value is incorrect
- 4.3 AD62C High-Speed Counter Unit
  - 4.3.1 Error code list
  - 4.3.2 RUN LED is flashing/OFF
  - 4.3.3 LINK RUN LED is OFF
  - 4.3.4 LINK ERR. LED is ON
  - 4.3.5 Count value is incorrect
- 4.4 A1SD61 High-Speed Counter Module
  - 4.4.1 Error code list
  - 4.4.2 RUN LED flashes or OFF
  - 4.4.3 Counter value is incorrect
  - 4.4.4 Count cannot be made
- 4.5 Nomenclature
  - 4.5.1 AD61(S1)
  - 4.5.2 A0J2-D61(S1)
  - 4.5.3 AD61C
  - 4.5.4 AD62C
  - 4.5.5 A1SD61
- 4.6 Performance Specifications
  - 4.6.1 AD61(S1)
  - 4.6.2 A0J2-D61(S1)
  - 4.6.3 AD61C
  - 4.6.4 AD62C
  - 4.6.5 A1SD61
- 4.7 Wiring instructions
- 4.8 Connection Example
5. MELSECNET II
- 5.1 Link Monitoring Using GPP,HGP and PHP
  - 5.1.1 Master station link monitor
  - 5.1.2 Local station link monitor
  - 5.1.3 Remote I/O station link monitor
- 5.2 Monitoring the Special Relays and Special Registers Used for the Link
- 5.3 Troubleshooting Flow Chart
  - 5.3.1 General troubleshooting flow chart
  - 5.3.2 Troubleshooting flow chart for when the data link is disabled throughout the entire system
  - 5.3.3 Troubleshooting flow chart for when the data link is disabled at a specific station
  - 5.3.4 Troubleshooting flow chart for when a data send/receive error occurs
  - 5.3.5 Troubleshooting flow chart for when unspecified number of slave stations become faulty
- 5.4 Error LED
- 5.5 Link Special Relay and Special Register
  - 5.5.1 MELSECNET data link
  - 5.5.2 MELSECNET/B data link
- 5.6 Self-Diagnosis Function
  - 5.6.1 Self-loopback test
  - 5.6.2 Station-to-station test
  - 5.6.3 Forward loop test and reverse loop test

Mitsubishi Electric MELSEC A Series Training Manual

Mitsubishi Electric MELSEC A Series manual cover

Pages 282

Year 1993

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of 282

Mitsubishi Electric MELSEC A Series Specification

The Mitsubishi Electric MELSEC A Series represents a robust line of programmable logic controllers (PLCs) designed to deliver reliable performance across diverse industrial automation applications. These controllers are engineered to offer high-speed processing capabilities, ensuring rapid execution of control tasks crucial for optimizing manufacturing and production processes. The A Series supports a wide range of input/output modules, allowing for flexible and scalable configurations tailored to specific operational requirements. It features a modular architecture, facilitating easy system expansion and maintenance, which is vital for adapting to evolving industrial demands.

The A Series PLCs are equipped with an extensive memory capacity that supports complex programming and data management, enabling sophisticated control strategies and enhanced system functionality. They incorporate advanced communication interfaces, including serial and network options, to ensure seamless integration with other automation systems and devices. This connectivity is pivotal for achieving comprehensive system control and monitoring, enhancing overall efficiency.

Designed for durability, the MELSEC A Series is built to withstand harsh industrial environments, ensuring consistent performance and longevity. User-friendly programming software accompanies the hardware, simplifying the development and deployment of control applications. The software provides intuitive tools for programming, debugging, and system diagnostics, which significantly reduces setup time and operational downtime.

Overall, the Mitsubishi Electric MELSEC A Series delivers a versatile and reliable solution for automation needs, combining powerful processing capabilities, flexible configurations, and robust communication options to meet the demands of modern industrial environments.

Mitsubishi Electric MELSEC A Series F.A.Q.

How can I perform a basic setup for the Mitsubishi Electric MELSEC A Series PLC?

To perform a basic setup, first connect the power supply and ensure all modules are properly seated. Use the programming software to configure I/O modules, set up communication parameters, and download your initial program to the PLC.

What steps should I take to troubleshoot communication issues with the MELSEC A Series?

Check all physical connections and ensure the correct communication protocol is selected. Verify that all devices on the network have unique addresses and that the communication settings match the configuration in the software.

How do I reset the MELSEC A Series PLC to factory settings?

To reset the PLC, turn off the power, set the initialization switch to the 'ON' position, and then power up the PLC. After a few seconds, turn off the power and set the switch back to 'OFF' before powering up again.

What are the maintenance requirements for the MELSEC A Series PLC?

Regularly check for dust accumulation and clean the PLC and modules with compressed air. Ensure all connections are tight and inspect for any signs of wear or damage. Periodically update the PLC firmware and back up programs.

How can I expand the I/O capacity of my MELSEC A Series PLC?

To expand I/O capacity, add additional I/O modules to the existing base unit. Ensure that the power supply can handle the additional load and update the PLC configuration in the programming software to reflect the new modules.

What should I do if the MELSEC A Series PLC is not powering on?

Check the power supply for proper voltage and connections. Inspect the fuses and replace if necessary. Ensure that the power supply module is functioning correctly and not overloaded.

How can I update the firmware of the MELSEC A Series PLC?

Download the latest firmware from Mitsubishi Electric's official website. Use the appropriate programming software to connect to the PLC and follow the instructions to upload the new firmware.

What precautions should I take when handling the MELSEC A Series PLC?

Always power down the PLC before installing or removing modules. Use anti-static precautions, such as wearing a wrist strap, to prevent damage from static electricity. Handle the PLC modules by their edges to avoid damage to components.

How do I configure a new communication network with the MELSEC A Series?

In the programming software, set up the network parameters including the IP address, subnet mask, and gateway. Configure the communication settings on all connected devices to ensure they match the network settings of the PLC.

What are common error codes for the MELSEC A Series PLC and their meanings?

Common error codes include E0 (CPU error), E1 (I/O error), and E2 (communication error). Refer to the PLC's manual for a complete list of error codes and recommended troubleshooting steps.