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APPX
Appendix 10 Operation Image and Data Structure of Predefined Protocol
For "Send & Receive" communication type
The packet is sent once. If the send completed successfully, the module shifts to the receiving standby state. When data is
received from the external device, it is verified with the receive packet (expected packet). If it matches, the receive processing
ends.
The operation image of "Send & Receive" is shown below.
■When the instruction completed successfully
Receive data 1
Receive data 2
DataHeader
Data
Data
Header
Send data
Data Header
Receive packet
(expected packet)
Ethernet-equipped module
Not matched
Matched
Received
Sixteen receive packets
can be specified.
External device
Discarded
Ethernet-equipped module
External device
ECPRTCL instruction
Completion device
Send packet Receive data
Send packet Receive data
Completion device + 1
The receive data matched
the receive packet
(expected packet).
Waiting time
to send
Waiting time
to receive
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