Omron CVM1-CLK21, CS1W-RPT01, CQM1H-CLK21 Fins Commands and Responses, Fins Communications Service

FINS Commands and Responses Section 6-4

6-4 FINS Commands and Responses

6-4-1 FINS Communications Service

The FINS communications service is a communications protocol developed by OMRON for FA control devices. It can be used for reading from and writing to PLC memory, or for controlling various operations, without having to create a user’s program at the PLC. The FINS communications service has its own independent address system which does not rely on the actual network address system, so it can carry out communications in the same way regard- less of whether the PLC at the local node is on a Controller Link Network or some other FA network (e.g., SYSMAC NET or SYSMAC LINK). For details on FINS commands, refer to the FINS Commands Reference Manual (W227).

6-4-2 Sending and Receiving FINS Commands and Responses

FINS commands can be sent by using the CMND instruction with a CVM1, CV-series, CS/CJ-series, or CQM1H-series PLC. The following diagram shows the data format for sending FINS commands and receiving responses. The data that is sent and received is all hexadecimal unless otherwise noted.

1 byte

1 byte

Word

0

15

87

S

@CMND

Command

S+1

S+2

S

D

C

1 byte

1 byte

Word

0

15

87

Response

D

Automatically prepared and added.

D+1

D+2

2 bytes

2,000 bytes max.

FINS header

Controller

CPU Unit

Link Unit

Automatically pre- Command code

Text

Computer

pared and added.

CS/CJ, CVM1,

CV-series,

Command

or CQM1H-

series PLC

			Controller Link
	Response		Support Board
	2 bytes	2 bytes	1,998 bytes max.
FINS header
Automatically	Command	Response	Text
added.	code	code

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