Omron CS1W-DRM21, CJ1W-DRM21 operation manual Fins Message Communications, Overall Structure

Overview Section 6-1

Overall Structure

CPU Unit

CMND(490) instruction

CMND(490) instruction (2801 Hex)

DeviceNet Unit

FINS

FINS messagemessage function

Explicit

FINS Explicit messagemessage function

DeviceNet network

OMRON special message communications FINS message

DeviceNet message communications Explicit message

Note If only the message communications function is being used and the remote I/ O communications function is not being used, message communications are possible even if the master function is disabled. In this case, it is not neces- sary to register a scan list.

6-1-2	FINS Message Communications
		Messages can be exchanged using FINS commands between DeviceNet
		nodes (masters and/or slaves) that support FINS messages.
Type of FINS message		Data send/receive			FINS commands
Network		SEND/RECV instructions		CMND(490) instructions
communications
instructions
PC to PC (both must be		CS/CJ-series PC	CS/CJ-series P	CS/CJ-series PC		CS/CJ-series PC
CS/CJ-series PCs with a
							Command to
CS/CJ-series DeviceNet
Unit) (See note 1.)							Master Unit
Note: Inter-network							d
					Comman
communications is pos-
sible with other
DeviceNet networks,						CS/CJ-series PC
Controller Link networks,
or other networks. (See							Command to
note 2.)
							CPU Unit
					Command
PC to OMRON Slave		CS/CJ-series PC		CS/CJ-series PC
						Command
							Slave
			Slave
Data length (excluding		SEND instruction: 267 words; RECV instruc-		542 bytes max.
command code)		tion: 269 words

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