Omron CS1W-FLN22 Operation Manual page 119

Overview of FINS Communications
Local node to remote node
PLC to PLC
• Units and Boards that support FINS commands return responses auto-
matically, so there is no need for a program at the receiving end.
• The FINS communications service is mainly used between OMRON CPU
Bus Units, CPU Units, and Support Boards for FA Computers. By cor-
rectly setting information such as headers, however, it can also be used
from ordinary Ethernet communications devices.
The FINS communications service can be used from a PLC with either of the
following three instructions:
• SEND(090)/RECV(098)
SEND(090) and RECV(098) are used to send and receive data (area read-
ing and writing).
• CMND(490)
CMND(490) is used to send FINS commands. The particular FINS com-
mands that are supported vary depending of the type of Unit or Board. For
details on FINS commands addressed to FL-net Units, refer to 7-5 Com-
mand/Response Reference. For details regarding FINS commands ad-
dressed to CS/CJ-series CPU Units, refer to the CS/CJ-series
Programmable Controllers Communications Commands Reference Man-
ual (W342).
The following table shows how the FINS communications service is used by
the communications source and destination.
SEND(090)/RECV(098)
• When the PLC executes SEND(090) or
RECV(098), a program is not required for
receiving a response.
• When the PLC receives a SEND(090) or
RECV(098) instruction, a program is not
required for processing the instruction.
CPU Unit
PLC PLC
CMND(490) (FINS commands)
• When the PLC executes CMND(490), a
program is not required for receiving a re-
sponse.
• When the PLC receives a CMND(490) in-
struction, a program is not required for
processing the instruction.
CPU Unit
FL-net Unit
PLC
When addressed to CPU Unit
User program
Section 7-1
CPU Unit
PLC
CPU Unit
User program
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