Mitsubishi Electric MELSEC iQ-R02CPU - Operation Image of each Communication Type of Protocol; For Send Only Communication Type; Appendix 10 Operation Image and Data Structure of Predefined Protocol

APPX
Appendix 10 Operation Image and Data Structure of Predefined Protocol
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Appendix 10Operation Image and Data Structure of
Predefined Protocol
Operation image of each communication type of protocol
With the predefined protocol support function, data is communicated with the external device using the "Send Only", "Receive
Only", and "Send & Receive" communication types.
This section describes the operation images of each communication type.
For "Send Only" communication type
The specified packet is sent once.
The operation image of "Send Only" is shown below.
■When the instruction completed successfully
■When the instruction completed with an error at TCP/IP (timeout error)
Send data
Ethernet-equipped
module
External deviceData Header
Ethernet-equipped module
External device
ECPRTCL instruction
Completion device
Send packet
Send packet
Completion device + 1
Waiting time to send
Ethernet-equipped module
External device
ECPRTCL instruction
Completion device
Completion device + 1
An error has
occurred.
The device
turns on upon
abnormal end.
t: TCP ULP timer
The packet cannot be sent or
no response is received from
the external device.
Send packet
Waiting time
to send