Standalone Check Of The Network Module (Offline Tests) - Mitsubishi Electric QJ71LP21 Reference Manual

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION

4.7 Standalone Check of the Network Module (Offline Tests)

Flow of offline tests
Test start
Self-loopback test
Mode setting switch: 1 or 5
Test result?
Test completed
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Before executing the data link operation, check the network module and the cables.
Select a test using the mode setting switch on the front of the network module.
The following three test are available for the offline tests:
(1) Self-loopback test (mode setting switch: 1 or 5)
This test checks the hardware of the internal circuits, including the send/receive
circuit of the network module, as well as the cables.
(2) Internal self-loopback test (mode setting switch: 2 or 6)
This test checks the hardware of the internal circuits, including the send/receive
circuit of the network module.
(3) Hardware test (mode setting switch: 3 or 7)
This test checks the hardware inside the network module.
NG
OK
Internal self-loopback test
Mode setting switch: 2 or 6
Test result?
Defective cable
Corrective action:
Replace cable
REMARK
The data link operation cannot be executed normally if at least one station is placed
in the test mode (offline, MODE switches 1 to 3 or 5 to 7) during data linking (online).
NG
OK
Hardware test
Mode setting switch: 3 or 7
Test result?
Defective send/receive
circuit
Corrective action:
Replace module
NG
OK
Defective internal circuit
Corrective action:
Replace module
MELSEC-Q
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