Omron CJ1W-CRM21, Operation Manual

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FINS Commands and Responses Section 6-1
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6-1-3 Response Code List
Response codes are 2-byte codes which indicate the results of command
execution. They are returned in the response following the command code.
The first byte of a response code is the MRES (main response code), which
categorizes the results of command execution. The second byte is the SRES
(sub-response code) which specifies the results.
Figure 6.2: Response code
The MRES codes are shown in the following table along with the results they
indicate. Refer to
Communications Commands Reference Manual (W342) for
details on response codes including the SRES.
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6-1-4 Sending FINS using CMND
The CMND instruction can be executed from the user program in a CS/CJ-
series PLC. CMND sends “n” bytes of command data beginning with S (the
beginning send word for storing command data at the source node) to
destination node N. In return, “m” bytes of response data are stored at the
source node beginning with D (the beginning receive word for storing
response data)
Command code Name
MRC SRC
01 01 MEMORY AREA READ
21 02 ERROR LOG READ
03 ERROR LOG CLEAR
MRES Execution results
00 Normal completion
01 Master Unit error
02 Slave device error
04 Service not supported
10 Command format error
11 Parameter error
20 Read not possible
22 Status error
Command
code Response
code
MRC: Main request code
SRC: Sub-request code
MRES: Main response code
SRES: Sub-response
code
MRC SRC MRES SRES
Note The MRES codes are shown in the following table along with the results
they indicate. Refer to Communications
Commands Reference Manual
(W342) for details on response codes including the SRES.