Mitsubishi Electric MELSEC-L SERIES Basic User Manual page 215

(c) Timing chart
The E71 performs the following process according to the timing of cancel request.
Protocol execution status
(address: 54C0 )
H
0: Unexecuted
1: Waiting for transmission
2: Sending
3: Waiting for data reception
4: Receiving
5: Completed
The followings describe the operations of protocol cancellation according to the timing.
• When the cancel request is performed before sending
(when "1" (Waiting for transmission) is set in Protocol execution status (address: 54C0
ECPRTCL instruction
Completion device
Completion device + 1
Connection No.n
Protocol cancellation specification
(54D3 (when the value of n is 1))
H
E71
Connected device
E71 operations at cancel request
No process
The E71 cancels the sending and terminates the dedicated instruction forcibly.
The E71 terminates the dedicated instruction forcibly at sending completion.
The E71 cancels the receiving and terminates the dedicated instruction forcibly.
The E71 terminates the dedicated instruction forcibly at receiving completion.
The E71 terminates the dedicated instruction when protocols are executed
consecutively.
1: Cancellation request
Waiting time
to send
Cancel
Send packet
Send packet
CHAPTER 15 DEDICATED INSTRUCTIONS
))
H
The device turns on
upon abnormal end.
2: Cancel completed
The E71 does not send a send
packet to the connected device
even when a receive data or a
protocol exists.
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