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●Send/Receive Messages
[Frames of send/receive messages]
Send message
*
PLC
*
Receive message
[Relationship between send area S (PMCR instruction operand) and send message]
CPU→SCU
Send area:S
SCU → Destination Device
Send message
[Relationship between receive area R (PMCR instruction operand) and receive message]
Destination Device →SCU
Receive message
Receive area: R
*
*
*
Data
*
*
*
Data
+0 word
Bit
15
0
*
*
*
*
No. of send
area words
*
*
*
No. of receive
area words
Bit
15
SCU → CPU
*
*
*
+0 word
*
*
CR
Terminator
*
*
CR
Terminator
+1 word
+2 words
15
0
15
*
*
*
*
*
*
*
*
*
Data
*
*
*
Data
0
15
0
15
*
*
*
*
*
*
+1 word
9．Program
LF
Destination
Device
LF
+(n-1) words
0
15
0
*
*
*
*
*
*
*
CR
LF
Terminator
*
*
CR
LF
Terminator
0
15
*
*
*
*
*
*
+2 words
+(n-1) words
50
0
*
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