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MELSEC-Q
8 TROUBLESHOOTING
(3) 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 stop
4) SW004B: Host CPU status
5) SW004D: Data linking start status (host)
6) SW004F: Data linking stop status (host)
7) SW0051: Data linking start status (entire system)
8) SW0053: Data linking stop status (entire system)
9) SW0055: Parameter setting status
10) SW00EE: Transient transmission error
11) SW00EF: Transient transmission error pointer
12) SW00F0 to 00FF: Transient transmission error history
13) SW01C4: Remote sub-master station switching result
(4) Storage of the error codes of dedicated instructions
Check the error code generated when a dedicated instruction is executed
through the device data below.
The error codes of the transient transmission are also stored in the link special
registers SW00EE to SW0FF.
For the details of the REMFR/REMTO instruction, refer to the description on the
programming of dedicated instructions in Section 7.1.1.
For details about READ/WRITE instructions, refer to the Q corresponding
MELSECNET/H Network System Reference Manual (PLC to PLC network).
1) REMFR, REMTO ·············
SW0031 (When channel 1 is used)
SW0033 (When channel 2 is used)
SW0035 (When channel 3 is used)
SW0037 (When channel 4 is used)
SW0039 (When channel 5 is used)
SW003B (When channel 6 is used)
SW003D (When channel 7 is used)
SW003F (When channel 8 is used)
3) READ, WRITE·················
Control data completion status (S1) +1