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MELSEC-Q
8 TROUBLESHOOTING
(2) Checking error codes with devices
To monitor the error code from an Ethernet module and so on using the MELSEC
communication protocol, check the link special register below.
1) SW0020: Module status
2) SW0048: Cause of baton pass interruption
3) SW0049: Cause of data link transmission stop
4) SW004B: Host CPU status
5) SW004D: Data link running status (host)
6) SW004F: Data link stop status (host)
7) SW0051: Data link running status (entire system)
8) SW0053: Data link stop status (entire system)
9) SW0055: Parameter setting status
10) SW00EE: Transient transmission error
11) SW004F: Transient transmission error pointer
12) SW00F0 to 00FF: Transient transmission error history
13) SW01C4: Result of switching to the remote sub-master station
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