212
(b) Operations after execution of cancel request
[Operations of the ECPRTCL instruction]
• The ECPRTCL instruction ends abnormally and Protocol cancel request error (error code: C404
H
) is
stored in Completion status (S)+1.
• When cancel request is executed to the nth protocol while multiple protocols are being executed
consecutively, the E71 terminates the nth protocol forcibly and the following protocols are not executed.
The following table lists the control data that are stored when protocols are canceled.
[Operations of the E71]
• If the cancel request is executed when any protocol is not being executed, the E71 completes the cancel
without any process.
● If any data is received from the connected device after the protocol whose communication type includes receiving is
canceled, the data will be discarded.
● The E71 checks whether any cancel request exists at periodic processing. For this reason, it may take some time to
process the cancellation after the cancel request is executed.
● When Protocol cancellation specification (address: 54D3H (Connection No.1)) is "1: Cancellation request", the next
ECPRTCL instruction cannot be executed.
Device Item Stored value
(S)+0 Execution count result
The number of protocols executed including canceled
protocols
(When cancel request is executed to the second
protocol, 2 is stored.)
(S)+1 Completion status
Protocol cancel request error (error code: C404
H
)
(S+10) to (S+17) Matched receive packet No.1 to 8
Matched receive packet number of the executed
protocol
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