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Overview of FINS Commands and Responses Section 6-2
6-2 Overview of FINS Commands and Responses
6-2-1 FINS Communications Service
FINS communications uses a communications protocol that was developed by
OMRON for its factory automation (FA) control systems.
For information on FINS commands, refer to the CS/CJ-series PLC Communi-
cations Command Reference Manual (Cat. No. W342).
6-2-2 Sending and Receiving FINS Commands and Responses
FINS commands are sent using CMND(490) for CS/CJ-series PLCs.
Command Code The command code is a 2-byte code that indicates the contents of the com-
mand. A FINS command must begin with a 2-byte command code. If there are
parameters, they are included after the command code.
Completion Code The Completion Code is a 2-byte code that indicates the execution results of
the command. The main response code (MRES) in the first byte of the Com-
pletion Code classifies the execution results, and the sub-response code
(SRES) in the next byte provides detailed results.
The following table shows the correspondence between execution results and
the MRES. For details on Completion Codes including sub-response codes
(SRES) and on error processing, refer to the CS/CJ-series Communications
Command Reference Manual (Cat. No. W342).
Command
Command
FINS header
Command
code
Completion
Code
Text
Automatically
generated and
attached.
2 bytes 2 bytes 538 bytes max.
FINS header
Command
code
Text
Automatically
generated and
attached.
2 bytes 540 bytes max.
MRES Execution result MRES Execution result
00 Normal completion 20 Read not possible
01 Local node error 21 Write not possible
02 Remote node error 22 Operating mode error
03 Controller error 23 No such Unit
04 Unsupported setting error (ser-
vice not supported)
24 Start/stop not possible
05 Routing error 25 Unit error
10 Command format error 26 Command error
11 Parameter error 30 Access control error
40 Service aborted
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