Omron SYSMAC CJ Series, Operation Manual

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FINS commands Section 3-4
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3-4 FINS commands
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
can be used to:
• Read from and write to the PLC memory or the CJ1W-MCH72 memory.
• Control various operations.
The FINS communications can be issued from a PLC CPU or a host computer,
and they can also be sent to any of these. The specific commands that can be
sent depend on the destination.
A FINS command is defined by its command code and its response code. A
command code is a 2-byte hexadecimal code. FINS commands always begin
with a 2-byte command code. The required parameters come after the
command code.
The response code is a 2-byte hexadecimal code that indicates the results of
the command execution. The first byte provides the main response code
(MRES), which classifies the results. The table below lists the MRES codes.
The second byte provides the sub-response code (SRES), which contains
details about the results.
/i
The CJ1W-MCH72 supports the following FINS commands:
• Read (0101)
• Write (0102)
• Parameter Area Read (0201)
• Parameter Area Write (0202)
• Run (0401)
• Stop (0402)
For more information on FINS, refer to the Communication Commands
Reference manual (W342-E1).
MRES Execution result
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
Note If the FINS command was not completed normally, the 2-byte response code is not
equal to 0000. Also, the response frame does not contain any additional data. Data can
only be returned - depending on the command - when the response code is 0000.