Contents

SAFETY PRECAUTIONS
CONDITIONS OF USE FOR THE PRODUCT
REVISIONS
INTRODUCTION
CONTENTS
OVERVIEW OF MANUAL
Reference Manuals
GUIDANCE
- 1. GENERAL DESCRIPTION
  - 1.1 Features
  - 1.2 System Configuration
    - 1.2.1 Configuration of a two-tier system
    - 1.2.2 Configuration of a multi-tier system
  - 1.3 Abbreviations Used in Paragraphs, Tables and Figures
  - 1.4 PLC to PLC Network and Remote I/O Network
  - 1.5 Applicable CPUs
- 2. SPECIFICATIONS
  - 2.1 Performance Specifications
  - 2.2 Optical fiber cable specifications
  - 2.3 Coaxial Cable
    - 2.3.1 Coaxial cable
    - 2.3.2 Connector for the coaxial cable
- 3. SETTINGS AND CONNECTIONS OF THE NETWORK MODULE
  - 3.1 Pre-operation Procedure
  - 3.2 Names of Parts and Connections of the Optical/ Coaxial Loop System
    - 3.2.1 Names of Parts and settings
    - 3.2.2 Precautions for cable connections
    - 3.2.3 Connecting method
  - 3.3 Names of Parts and Connections of the Coaxial Bus System
    - 3.3.1 Names of parts and settings
    - 3.3.2 Precautions for cable connections
    - 3.3.3 Connecting method
  - 3.4 Checking the Network Module and Connections (Off-Line Check)
    - 3.4.1 Hardware test
    - 3.4.2 Internal self-loopback test
    - 3.4.3 Self-loopback test
    - 3.4.4 Station-to-station test
    - 3.4.5 Forward loop / reverse loop test (Optical and Coaxial loop system only)
    - 3.4.6 Checking the network numbers, group numbers, and station numbers
- 4. DATA LINK WITH A TWO-TIER SYSTEM
  - 4.1 Communications by Setting Default Parameters
    - 4.1.1 Settings with the network module
    - 4.1.2 Setting parameters with the peripheral devices
    - 4.1.3 Confirming the cyclic transmission function
    - 4.1.4 Confirming the transient transmission function
  - 4.2 Communications by Setting Common Parameters
    - 4.2.1 Common parameters
    - 4.2.2 Settings with the network module
    - 4.2.3 Setting parameters with the peripheral devices
    - 4.2.4 Confirming the cyclic transmission function
    - 4.2.5 Confirming the transient transmission function
- 5. DATA LINK WITH A MULTI-TIER SYSTEM
  - 5.1 Setting the Network Refresh Parameters
    - 5.1.1 Designating the network refresh parameter ranges
    - 5.1.2 Setting the network refresh parameters by using a peripheral device
    - 5.1.3 Confirming the ranges of data transfer
  - 5.2 Setting the Transfer Parameter for Data Link
    - 5.2.1 Designating the ranges of transfer parameter for data link
    - 5.2.2 Setting the transfer parameter for data link by using a peripheral device
    - 5.2.3 Confirming that data is transferred to other network
  - 5.3 Setting Routing Parameter
    - 5.3.1 Setting the routing parameter
    - 5.3.2 Setting the routing parameter by using a peripheral device
    - 5.3.3 Confirming routing parameter settings
    - 5.3.4 Accessing an other network by using the transient transmission function
- 6. NETWORK MONITOR
  - 6.1 Line Monitor
    - 6.1.1 Checking the line condition and link scan time (Line monitor)
    - 6.1.2 Checking the condition of the control station and data link (Detailed line monitor)
    - 6.1.3 Checking the condition of communication, data link, CPU, and loop (Line monitor of another station)
      - (1) Communication condition of each station
      - (2) Data link condition of each station
      - (3) Parameter condition of each station
      - (4) CPU operation condition of each station
      - (5) CPU RUN operation of each station
      - (6) Loop condition of each station (Optical loop system only)
      - (7) Reserve designation of each station
  - 6.2 Condition Monitor
    - 6.2.1 Checking the module conditions of the host station (Condition monitor)
    - 6.2.2 Checking the switch and parameter settings and data link condition of the host station (Detailed condition monitor)
    - 6.2.3 Checking the on-line/off-line test conditions of the host station (Test monitor)
  - 6.3 Error List Monitor
    - 6.3.1 Checking the accumulated number of times of line errors (Error list monitor)
    - 6.3.2 Checking the factors for loop switching (Loop switching data display)
    - 6.3.3 Checking errors occurred with transient transmission (Transient transmission error)
    - 6.3.4 Clearing error history contents
DETAILED INFORMATION
- 7. SYSTEM CONFIGURATION
  - 7.1 Two-Tier System
    - 7.1.1 Two-tier system with AnUCPU + AJ71LP21 (AJ71BR11)
    - 7.1.2 Two-tier system with AnUCPU + AnACPU + AnNCPU + AJ71LP21 (AJ71BR11)
  - 7.2 Multi- Tier System
    - 7.2.1 Multi-tier system with MELSECNET/10 only
    - 7.2.2 Multi-tier system with MELSECNET/10 and MELSECNET(II)
  - 7.3 System Configuration with MELSECNET/10 and MELSECNET(II) Connected by the AnN/AnACPU
  - 7.4 Precautions for System Configuration
- 8. FUNCTIONS
  - 8.1 Cyclic Transmission Function
    - 8.1.1 Communications with B/W (N:N communication)
    - 8.1.2 Communications with X/Y (1:N communication)
    - 8.1.3 Constant link scan function
    - 8.1.4 Data link stop/restart function
    - 8.1.5 Data link transfer function
  - 8.2 Transient Transmission Function
    - 8.2.1 N:N communication function
    - 8.2.2 Transient transmission frequency designation function
    - 8.2.3 Routing function
    - 8.2.4 Group function
  - 8.3 Control Station Shift Function
  - 8.4 Multiplex Transmission Function (Optical Loop system)
  - 8.5 RAS Function
    - 8.5.1 Automatic on-line return function
    - 8.5.2 Loopback function (Optical loop system)
    - 8.5.3 Station separation function (Coaxial bus system)
    - 8.5.4 Diagnosis function
    - 8.5.5 Data link condition detection function
- 9. COMMUNICATION PROCESSING AND PROCESSING TIME OF THA DATA LINK
  - 9.1 Link Data Communication Processing
    - 9.1.1 Overview of communication processing
    - 9.1.2 Timing for link refresh processing
    - 9.1.3 Link data of stations at which a communication error has occurred or communication is stopped
  - 9.2 Transmission Delay Time
    - 9.2.1 Transmission delay in a two-tier system
    - 9.2.2 Transmission delay in communication between data links
    - 9.2.3 Transmission delay time due to routing
    - 9.2.4 How to reduce the link refresh time
- 10. NETWORK SETTINGS
  - 10.1 Data Link Parameters
    - 10.1.1 "Set number of modules" settings
    - 10.1.2 Network refresh parameters
    - 10.1.3 Common parameters
    - 10.1.4 Station specific parameters
    - 10.1.5 Transfer parameters for data link
  - 10.2 Routing Parameters
  - 10.3 Default Parameters
- 11. COMPOSITE SYSTEMS
  - 11.1 MELSECNET/10 Composite System Comprising AnS/AnN/AnACPUs
  - 11.2 Systems in Witch MELSECNET/10 and MELSECNET II Networks are Connected
- 12. PROGRAMMING
  - 12.1 Precautions When Writing Programs
  - 12.2 Special Link Relays (SB)
    - 12.2.1 Situation when a network module is mounted on an AnU/A2ASCPU
    - 12.2.2 Situation when a network module is mounted on an AnS/AnN/AnACPU
  - 12.3 Special Link Registers (SW)
    - 12.3.1 Situation when a network module is mounted on an AnU/A2ASCPU
    - 12.3.2 Situation when the network module is mounted on an AnS/AnN/AnACPU
  - 12.4 SB/SW Valid for Offline Diagnostics
  - 12.5 Program Example for Reading/Writing Data of Other Stations
- 13. TROUBLESHOOTING
  - 13.1 Error Codes
  - 13.2 Troubleshooting
    - 13.2.1 Points to check first
    - 13.2.2 Troubleshooting when data link is disable throughout the system
    - 13.2.3 Troubleshooting when the data link is disable at a specific station
    - 13.2.4 Troubleshooting when the communicated data is abnormal
      - (1) Abnormal cyclic transmission data
      - (2) Abnormal transient transmission
  - 13.3 LEDs on the Network Module
APPENDICES
- APPENDIX 1 NETWORK PARAMETER SETTING SHEETS
  - 1.1 "Number of Modules" Settings
  - 1.2 Network Refresh Parameters
    - (1) MELSECNET/10
    - (2) MELSECNET II
  - 1.3 Common Parameters (MELSECNET/10), PLC to PLC Network
    - (1) LB/LW settings
    - (2) LX/LY settings
    - (3) Reserve station settings
    - (4) Extension settings
    - (5) Communication error setting
    - (6) Uniform allocation
    - (7) Allocation with number of points designation
  - 1.4 Station Specific Parameters
    - (1) LB settings
    - (2) LW settings
  - 1.5 Transfer Parameters for Data Link
  - 1.6 Routing parameters
  - 1.7 Network Module Settings
WARRANTY

Mitsubishi Electric AJ71LP21, AJ71LBR11 Reference Manual

Mitsubishi Electric AJ71LP21, AJ71LBR11 manual cover

Pages 306

Year 1993

Language(s)

of 306

Mitsubishi Electric AJ71LP21, AJ71LBR11 Specification

The Mitsubishi Electric AJ71LP21 and AJ71LBR11 are advanced communication modules designed to facilitate seamless data exchange in industrial automation systems. These modules are part of the Mitsubishi MELSEC series, known for their reliability and performance in complex industrial environments. The AJ71LP21 is a Link Module primarily utilized for connecting programmable logic controllers (PLCs) in a multi-drop network configuration. It supports the MELSECNET/B network, which enables high-speed data communication and ensures efficient information sharing across multiple PLCs. The AJ71LP21 module features a robust design that allows for quick installation and integration into existing systems, enhancing the scalability and flexibility of industrial networks.

On the other hand, the AJ71LBR11 is a Remote I/O Module that extends the capabilities of PLC systems by facilitating the connection of remote input/output devices over a network. This module is compatible with the MELSECNET/10 network, providing a reliable framework for transmitting I/O signals over long distances. The AJ71LBR11 ensures high-speed data transmission, which is crucial for maintaining process synchronization and operational efficiency in distributed control systems. Both modules incorporate advanced error detection and correction mechanisms, contributing to the overall stability and reliability of the communication network. They are designed to withstand harsh industrial conditions, offering high resistance to electrical noise and temperature variations. Overall, the Mitsubishi Electric AJ71LP21 and AJ71LBR11 modules are vital components in modern industrial automation, providing robust solutions for efficient network communication and remote device management.

Mitsubishi Electric AJ71LP21, AJ71LBR11 F.A.Q.

What are the basic steps for installing the AJ71LP21 module?

To install the AJ71LP21 module, first ensure that the power is off. Mount the module on the DIN rail, connect the power supply, and then connect the communication cables according to the wiring diagram. Finally, configure the module settings using the provided software.

How can I troubleshoot communication issues with the AJ71LBR11?

Start by checking all cable connections and ensuring they are secure. Verify that the correct communication parameters are set in the configuration software. Use diagnostic tools to check for errors in the data transmission. If issues persist, consult the user manual for further troubleshooting steps.

What maintenance practices are recommended for the AJ71LP21 module?

Regularly check for dust accumulation and clean the module with a dry, soft cloth. Inspect connections for signs of wear or corrosion and replace cables as necessary. Ensure firmware is up to date and perform periodic diagnostics to check for any hidden faults.

Can the AJ71LBR11 be used in a network with other PLC brands?

Yes, the AJ71LBR11 can be used in a network with other PLC brands, provided that the communication protocols are compatible. Ensure that the correct settings are applied for seamless integration and refer to the communication protocol documentation for guidance.

What should I do if the AJ71LP21 module does not power on?

First, check the power supply to ensure it is functioning correctly and that all connections are secure. Verify that the module is properly seated on the DIN rail. If the module still does not power on, it may need to be replaced or repaired by a qualified technician.

How do I update the firmware on the AJ71LBR11?

To update the firmware, download the latest version from the Mitsubishi Electric website. Connect the AJ71LBR11 to a computer using the appropriate interface, and use the designated firmware update tool to upload the new firmware to the module. Follow on-screen instructions carefully.

What are the key configuration settings for optimal performance of AJ71LP21?

Key settings include baud rate, parity, data bits, and stop bits. Ensure that these settings match those of the devices it communicates with. Additionally, configure the station number and network parameters accurately to avoid conflicts.

Is it possible to remotely monitor the AJ71LBR11 module?

Yes, remote monitoring is possible using a network connection. Configure the module with an appropriate IP address and subnet mask, and use compatible monitoring software to access real-time data and diagnostics from a remote location.

What types of communication protocols are supported by the AJ71LP21?

The AJ71LP21 supports several communication protocols, including CC-Link, Modbus RTU, and others. Refer to the module's technical specifications for a complete list of supported protocols.

How can I ensure data integrity when using the AJ71LBR11 in a high-noise environment?

Use shielded cables to minimize electromagnetic interference, and ensure that all connections are secure. Configure error-checking mechanisms, such as CRC checks, within the communication protocol settings to detect and correct transmission errors.