Omron CJ1W-CLK21-V1 ユーザーズマニュアル

With SEND, RECV, and CMND, the Network Instruction Enabled Flag and
Network Instruction Error Flag are generally written into the program as input
conditions, as shown below. Only one instruction can be executed at a time for
any given communications port. Exclusive control thus must be incorporated
to execute two or more instructions per operating level with C200HX/HG/HE
PLCs, nine or more instructions with CS/CJ-series, CVM1, and CV-series
PLCs (because CVM1 and CV-series PLCs have eight ports), or two or more
instructions with CQM1H-series PLCs.

Note With CS/CJ-series PLCs, ports 0 to 7 are also used for executing the PMCR

(Protocol Macro) instruction, therefore these flags are used for the 4 instruc-
tions, SEND/RECV/CMND/PMCR. When the PMCR command is being exe-
cuted, the same port cannot be used for SEND/RECV/CMND instructions.

KEEP A 
Keep instruction

Turns A ON from beginning to completion of 
communications instruction.

Reset B

A

Operand and 
control data cre-
ation by @MOV 
and @XFER

Communications 
instruction
@SEND
@RECV
@CMND

Creates operand and control data in a given area.

Executes communications instruction.

Network Instruction 
Enabled Flag

A

Startup differ-
ential
DIFU B

Creates reset input. (Turns reset B ON after execution of 
communications instruction.)

Network Instruction Error Flag

Network Instruction 
Enabled Flag

A

Reset D

In case of Send Error Flag, re-send processing 
can be executed.

Establishes exclusive control so that no communications 
instruction is started before the previous one has been 
completed.

Exclusive control to prevent simultaneous execution:

(Continues in the same way.)

Active Node Flag for 
source node

Active Node Flag for 
destination node

A

Execution 
condition

KEEP C
Keep instruc-
tion

C

Execution 
condition

Network Instruction 
Enabled Flag

Network Instruc-
tion Enabled Flag

A202

Port number corresponds 
to bit number, i.e., port 0: 
bit 00, port 1: bit 01, etc.

0: Execution not enabled (executing)
1: Execution enabled (not executing)

Network Instruc-
tion Error Flag

A219

Port number corresponds 
to bit number plus 8, i.e., 
port 0: bit 08, port 1: bit 09, 
etc.

0: Normal end
1: Abnormal end