Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 344

7 APPLICATION FUNCTIONS
Sequence scan
Send command
Sending side CPU
Send completion device
(Device designated in (D1))
Send completion device
(Device designated in (D1)+1)
Completion status
(Device designated in (S1)+1)
Network module
Network module
Interrupt program
Receiving side CPU
Sequence scan
Completion status
(Device designated
in (S1)+1)
7 - 120
(b) Abnormal completion
1) In case of the SEND instruction
SEND
0 END 0
ON
OFF
OFF
OFF
Data
sending
Send error
Resend (when designated for twice)
2) In case of the RECVS instruction
END 0
END 0
?
Channel 1
Data Data
sending sending
Channel 3
RECVS
IRET
END END
?
MELSEC-Q
END 0 END 0
OFF
ON
OFF
ON
OFF
One scan
Error code
0 END 0 END
Error code
END
7 - 120