Module Communication Test - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

Module communication test

The module communication test checks the hardware of the RJ71EN71 or the RnENCPU (network part). When the
communication using the RJ71EN71 or the RnENCPU (network part) is unstable, whether a hardware failure occurs or not
can be checked.
The following table lists the tests performed.
Test item
Internal self-loopback test
External self-loopback test
■Procedure (for a system other than a redundant system)
1.
Set the module operation mode for P1 and P2 each to module communication test mode in the following item.
[Navigation window]  [Parameter]  [Module Information]  [RJ71EN71]  [Module Parameter]  [Application
Settings]  [Module Operation Mode]
2.
Connect the P1 and P2 of the RJ71EN71 or the RnENCPU (network part) with an Ethernet cable.
3.
Write the module parameters to the CPU module.
4.
Reset or power off and on the CPU module to start the module communication test.
Do not perform a module communication test while connected to another station. The operation of another
station may failed.
■Procedure (for a redundant system)
To perform a module communication test for a redundant system, set the operation mode to separate mode. Before
execution, perform system switching in advance so that the module communication test target station operates as the standby
system.
The following describes a procedure for executing a module communication test for the RJ71EN71 of system B.
1.
Set the module operation mode of system A to online mode in the following item.
[Navigation window]  [Parameter]  [Module Information]  [RJ71EN71]  [Module Parameter]  [Application
Settings]  [Module Operation Mode]
2.
Set the module operation mode of system B to module communication test mode in the following item.
[Navigation window]  [Parameter]  [Module Information]  [RJ71EN71]  [Module Parameter]  [Application
Settings]  [Redundant System Settings]  [System B Module Operation Mode]
3.
Connect the P1 and P2 of the RJ71EN71 of system B with an Ethernet cable.
4.
Set the system B CPU module to the STOP state.
5.
Write the module parameters to the system B CPU module.
6.
Reset or power off and on the system B CPU module to start a module communication test.
• To perform a module communication test on system A, set the module operation mode of system A to
module communication test mode and the module operation mode of system B to online mode.
• When returning the module to a normal operation state after the test, reconnect the Ethernet cable as
before the test, and then execute the CPU module memory copy to transfer the parameters of the control
system to the standby system. ( MELSEC iQ-R CPU Module User's Manual (Application))
• Do not perform a module communication test while connected to another station. The operation of another
station may failed.
3 TROUBLESHOOTING
284
3.2 Checking the Module Status
Description
Checks whether the communication function of the module can be performed normally.
Checks whether the communication can be performed normally with the cable connected between two
connectors.