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Response Codes
6-7
Response Codes
6-7-1
Configuration
IR, SR, LR, HR, and AR Areas:
15 14 13 12 11 10
Bit
Bit 14
Bit 12
Bit 15
Bit 13
Timers/Counters: Status of the Completion Flag will be returned as fol-
lows:
00 (Hex): No forced status in effect
01 (Hex): Forced ON or forced OFF
This section describes the response codes returned with responses to FINS
commands. Response codes can be used to confirm normal completion of
command execution or to troubleshoot problems when commands fail. For fur-
ther troubleshooting information, refer to SECTION 9 Troubleshooting and
Maintenance of this manual and to the operation manuals for specific Units or
Systems.
Response codes for FINS commands consist of two bytes that indicate the
result of executing a command. The structure of the response codes is shown
in the following diagram.
First byte
7
6
5
4
Bit
Main response code (MRES)
1: Relay Error Flag
The main response code (MRES) in the first byte classifies the response and
the sub-response code (SRES) in the second byte indicates details under the
MRES classification.
If bit 7 of the first byte is ON, a network relay error has occurred. Refer to 6-7-
2 Network Relay Errors for details on troubleshooting the error.
If bit 6 or 7 of the second byte is ON, an error has occurred in the PLC or com-
puter returning the response. Refer to the operation manual for the device
returning the response for details when troubleshooting the error.
9
8
7
6
Bit 10
Bit 8
Bit 6
Bit 5
Bit 11
Bit 9
Bit 7
The status for each bit is as follows:
OFF (0): No forced status in effect
ON (1): Forced ON or forced OFF
3
2
1
0
7
6
Sub-response code (SRES)
Section 6-7
5
4
3
2
1
0
Bit 4
Bit 2
Bit 0
Bit 3
Bit 1
Second byte
5
4
3
2
1
0
1: PLC Non-fatal Error Flag
1: PLC Fatal Error Flag
225
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