Unit Tests Of The Network Module (Offline Test) - Mitsubishi Electric MELSEC Q Series Reference Manual

4 SETTING AND PROCEDURE BEFORE OPERATION

4.7 Unit Tests of the Network Module (Offline Test)

Flow of offline tests
Test start
Self-loopback test
Mode setting switch: 1 or 5
Test result?
Test completed
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The network module and the connected cable shall be tested before executing the
data link operation. Select the test item with the mode setting switch on the front of the
network module. The following three items are provided as the offline test.
(1) Self-loopback test (mode setting switch: 1 or 5)
This test checks the internal circuits including the send/receive circuits of the
network module together with the connected cable.
(2) Internal self-loopback test (mode setting switch: 2 or 6)
This test checks the internal circuits including the send/receive circuits of the
network module.
(3) Hardware test (mode setting switch: 3 or 7)
This test checks the internal components of the network module.
NG
OK
Internal self-loopback test
Mode setting switch: 2 or 6
Test result?
Defective cable
Corrective action:
Replace cable
POINT
If the test completes with an error, the possible cause is a hardware failure of the
network module. Please consult your local Mitsubishi representative.
REMARKS
If even one station is set to the test mode (offline, mode setting switch 1 to 3 or 5 to
7) during the data link (online), the normal data link cannot be maintained.
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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