344
(b) When the instruction ends abnormally (timeout error at sending)
(c) When the instruction ends abnormally (timeout error of waiting time to receive)
*1 When the receive packet (expected packet) is not matched to the data by the waiting time to receive or when the
existence of a connected device cannot be checked within the time specified by the destination alive check timer (the
time calculated based on the destination existence confirmation starting interval timer value, destination existence
confirmation interval timer value, and Destination existence confirmation resending time), the instruction ends
abnormally.
For the error occurred when the communication ends abnormally, refer to the error code stored in the buffer memory.
( Page 273, Section 16.7.3)
E71
Connected device
ECPRTCL instruction
Completion device
Receive data
Send packet
Completion device + 1
Waiting time
to send
t: TCP ULP timer
An error has occurred.
The device turns on
upon abnormal end.
Discarded
The packet cannot be
sent or no response is
received from the
connected device.
t: waiting time to receive or the time
specified by the destination alive check timer
*1
E71
Connected device
ECPRTCL instruction
Completion device
Send packet
Receive data
Receive data
Send packet
Completion device + 1
Waiting time
to send
An error has
occurred.
The device
turns on upon
abnormal end.
The receive data did not
match the receive packet
(expected packet).
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