APPX
Appendix 10 Operation Image and Data Structure of Predefined Protocol
399
A
■When the instruction completed with an error (timeout error at sending)
■When the instruction completed with an error (timeout error of waiting time to receive)
*1 When the receive packet (expected packet) verification does not match before the reception wait time, or when other device existence
cannot be checked within the destination alive check time (time calculated from destination alive check start interval timer value,
destination alive check interval timer value, and destination alive check resend count).
For details on errors that occur when the communication completed abnormally, refer to the error code stored
in the buffer memory.
( Page 310 List of Error Codes)
Ethernet-equipped module
External 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
external device.
t: waiting time to receive or the time
specified by the destination alive check timer
*1
Ethernet-equipped module
External 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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