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APPENDICES APPENDIX
Appendix 5 Operation Image and Data Structure of Predefined Protocol
When communication type is "Send & Receive"
A packet is sent once, and the status changes to the data receive wait stat after the transmission completes normally. Then,
data is received from the target device, and the process completes when the received data matches the receive packet and
the receiving process is performed.
The operation image of "Send & receive" is as follows.
■Normal completion
Transmitted data
C24
Terminator
Data
Command
Station
No. 2
Header
Receive data 1
Target
device
Header
Station
No. 1
Predefined receive packet
Receive data 2
Header
Station
No. 2
Verification match
Header
Station
No. 2
Up to 16 receive packet
can be specified
Verification match
Store verification-matched
receive packet number
(1 to 16)
CPU
module
Execute dedicated instruction
(G(P).CPRTCL)
Completion device
OFF at normal
completion
Status display device
at completion
(Receive
buffer clear)
Start waiting for receive data
* Only if it is specified
Send packet Receive packet
C24
Verification match
Receive packet
Send packet
Target device
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