For "Receive Only" Communication Type - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

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)

For "Receive Only" communication type

When data is received from the external device, it is verified with the receive packet (expected packet). If it matches, the
receive processing ends. If the verification does not match, the received data is discarded.
Ethernet-equipped module
Receive packet
(expected packet)
Data
Sixteen receive packets
can be specified.
The operation image of "Receive Only" is shown below.
■When the instruction completed successfully
ECPRTCL instruction
Completion device
Completion device + 1
Ethernet-equipped module
External device
APPX
396
Appendix 10 Operation Image and Data Structure of Predefined Protocol
Not matched
Header
Discarded
Matched
Header
Received
Receive data
The receive data matched
the receive packet
(expected packet).
Receive data
Receive data 1
Data
Receive data 2
Data
External device