Mitsubishi MELSEC LJ71C24, Руководство пользователя

Страница: 387 / 428

App. - 58 App. - 58
APPENDIXES
(a) Data communication using the predefined protocol
Set send or receive data storage area on the "Predefined Protocol Support
Function" screen of the predefined protocol support function in advance.
Then, communicate the data in the following procedures.
1) Write the send data to the link register W of the CPU module to store
the send data in the head module device.
2) Write the number of continuous executions of the protocol and the
execution protocol No. to the link register W of the CPU module to
write them to the C24 buffer memory.
3) Execute the protocol by receiving the protocol execution request
(Y3/YA).
4) The data received from the external device is transferred from the head
module device to the link register W of the CPU module.
5) Using the auto refresh function, results and the number of executions
of the predefined protocol and cross-checked receive packet number
are transferred from the C24 buffer memory to the head module
device and then to the CPU module device.
6) After execution of the protocol is completed, the protocol execution
completion (X5/XC) turns on.