Omron CS1W-ETN21 operation manual Writing Programs

Communicating between OMRON PLCs						Section 6-6
Usage		Command			Name	Function
			code
	MR			SR
File memory	22			01	FILE NAME READ	Reads file memory data.
	22			02	SINGLE FILE READ	Reads a specified length of file data
						from a specified position within a single
						file.
	22			03	SINGLE FILE WRITE	Writes a specified length of file data
						from a specified position within a single
						file.
	22			04	FILE MEMORY FORMAT	Formats (initializes) the file memory.
	22			05	FILE DELETE	Deletes specified files stored in the file
						memory.
	22			07	FILE COPY	Copies files from one file memory to
						another file memory in the same sys-
						tem.
	22			08	FILE NAME CHANGE	Changes a file name.
	22			0A	MEMORY AREA–FILE TRANSFER	Transfers or compares data between the
						I/O memory area and the file memory.
	22			0B	PARAMETER AREA–FILE TRANSFER	Transfers or compares data between the
						parameter area and the file memory.
	22			0C	PROGRAM AREA–FILE TRANSFER	Transfers or compares data between the
						UM (User Memory) area and the file
						memory.
	22			15	CREATE/DELETE DIRECTORY	Creates or deletes a directory.
Debugging	23			01	FORCED SET/RESET	Force-sets or force-resets bits, or
						releases force-set status.
	23			02	FORCED SET/RESET CANCEL	Cancels all bits that have been force-set
						or force-reset.

6-6-4 Writing Programs

Programs incorporating the SEND(090), RECV(098), and CMND(490) instructions are generally created using the Communications Port Enabled Flag and the Communications Port Error Flag as input conditions. CS/CJ- series CPU Units have eight communications ports. Only one instruction can be executed at any given port at one time, however, so the program must not overlap the use of any of the ports. A program example is provided below.

Communications port

Ethernet Unit	CPU Unit
	Instruction 1
	Instruction 2
	Instruction 3
	Instruction 4
	Instruction 5
	Instruction 6
	Instruction 7
	Instruction 8

There are eight communications ports, so up to eight communications instructions can be executed at a time. The number of messages that can be sent or received with a single CPU Bus Unit ser-vice, though, is not more than two each for the CPU Unit to the Ethernet Unit and for the Ethernet Unit to the CPU Unit.

141