Omron CVM1-CLK21, CS1W-RPT01, CJ1W-CLK21-V1 Simultaneous Execution of Communications Instructions

Using the Message Service	Section 6-3
Simultaneous Execution of Communications Instructions
C200HX/HG/HE PLCs	CS/CJ-series, CVM1, and CV-series PLCs

Controller Link Unit

	Controller Link Unit
CPU Unit		CPU Unit

Instruction 1

Operating level #0

Port

Instruction 1 Port

Instruction 2

Instruction 2

Instruction 3

Instruction 4

Instruction 5

Instruction 6

Operating	Port
level #1

Instruction 7 Instruction 8

There is only one communications port per operat- ing level, so no more than one communications in- struction can be executed per operating level at one time. When both operating levels are used, two instructions can be executed simultaneously.

CQM1H-series PLCs

Controller Link Unit

CPU Unit

There are eight communications ports, so eight communications can be executed simultane- ously. Only one message is refreshed from the CPU Unit to the Controller Link Unit and one from the Controller Link Unit to the CPU Unit for each CPU Bus Unit service time.

Instruction 1

Port

There is only one communications port, so no more than one communications instruction can be executed at one time.

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