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26 REDUNDANT FUNCTION
26.8 Redundant Function Module Communication Test
26.8 Redundant Function Module Communication Test
The hardware of the redundant function module is checked for an error when its communication is unstable.
The following table shows the test items included in the module communication test.
Execution procedure of the module communication test
1. Connect the engineering tool directly to the CPU module of the standby system.
2. Set the CPU module operating status to the STOP state.
3. Connect the IN and OUT connectors of the standby system redundant function module with a tracking cable. (A cable
disconnection error is detected in the control system.)
4. Open the "Redundant Operation" window of the engineering tool.
[Online] [Redundant PLC Operation] [Redundant Operation]
5. Click the [Execute Test] button of "Module Communication Test".
• LED status of the redundant function module during the module communication test
6. When the test is completed with an error, take actions according to "Corrective Action" in the test result window.
7. When the test is completed successfully, connect the control system and standby system with the tracking cable. (
Page 62 Redundant function modules)
8. Click the [Close] button in the "Redundant Operation" window to exit the module communication test.
9. Set the CPU module operating status to the RUN state.
The module communication test can be executed regardless of whether the backup mode or separate mode
is selected as the operation mode. In the backup mode, a tracking communication error is detected when a
tracking cable is disconnected.
Precautions
• Always connect the IN and OUT connectors of the redundant function module with the tracking cable before performing the
module communication test.
• Ensure that the module communication test is performed on the CPU module of the standby system. Performing the test on
the CPU module of the control system may cause an unintended operation.
Test item Description
Internal selfloopback test Checks whether the communication function of the redundant function module normally operates.
External selfloopback test Checks whether communications can be normally performed with a tracking cable that connects the IN connector and OUT
connector of the redundant function modules.
Status RUN LED ERR LED
Module communication test in execution Flashing Off
Completed successfully On Off
Completed with an error On On
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