Omron SYSMAC CJ1W-PRM21, Operation Manual

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FINS Commands and Responses
Section 5-1
5-1 FINS Commands and Responses
5-1-1 FINS Message Service Communications
FINS FINS (Factory Intelligent Network Services) commands are message service
communications commands developed by OMRON for Factory Automation
control devices. They do not depend on a particular transmission path, and an
be used for reading from and writing to PLC memory or the Unit’s memory,
sending or receiving acyclic messages over a network, or for controlling vari-
ous operations.
The FINS communications can be issued from a CPU Unit, Special I/O Unit,
or host computer, and they can also be sent to any of these. The specific com-
mands that can be sent depend on the destination.
When the source of the commands is a PLC CPU Unit, e.g. invoked by a user
program, the FINS commands are sent by means of CMND(490). For details
on FINS commands, refer to the
Communications Commands Reference
Manual (W342)
Command Codes Command codes are represented by a 2-byte hexadecimal code. FINS com-
mands always begin with a 2-byte command code; any parameters required
follow the command code.
Response Codes The response code consists of a 2-byte hexadecimal code indicating the
results of command execution. The first byte provides the main response
code (MRES), which classifies the results, the second byte provides the sub-
response code (SRES), which contains details about the results.
5-1-2 Command Code List
The command codes listed in the following table are supported by the PROFI-
BUS-DP Master Unit. A PLC program can send these to the Unit
.
5-1-3 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.
Command code Name Page
MRC SRC
01 01 MEMORY AREA READ 102
04 01 RUN 103
02 STOP 104
05 01 CONTROLLER DATA READ 105
21 02 ERROR LOG READ 105
03 ERROR LOG CLEAR 107
Command
code Response
code
MRC: Main request code
SRC: Sub-request
code
MRES: Main response code
SRES: Sub-response code
MRC SRC MRES SRES