4 - 10 4 - 10
MELSEC-Q
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
4.7 Standalone Check of the Network Module (Offline Tests)
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.
Test start
Self-loopback test
Mode setting switch: 1 or 5
Test result?
Test completed
Internal self-loopback test
Mode setting switch: 2 or 6
Test result?
Hardware test
Mode setting switch: 3 or 7
Test result?
Defective send/receive
circuit
Corrective action:
Replace module
Defective cable
Corrective action:
Replace cable
Defective internal circuit
Corrective action:
Replace module
NG
NG
NG
OK
OK
OK
Flow of offline tests
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).
To Next Page
Loading...
Need help?
General
