Mitsubishi MELSEC LJ71C24, User Manual

Page: 151 / 428

10 - 1 10 - 1
10 DATA COMMUNICATION USING THE NONPROCEDURAL PROTOCOL
10 DATA COMMUNICATION USING THE NONPROCEDURAL PROTOCOL
Nonprocedural protocol enables to send and receive data between a CPU module and
an external device, using the data format and transmission control procedure set by
user.
A sequence program for data communication is required on the CPU module side.
Use this protocol for data communication using any given data format.
Any data
Send
Receive
Any data
POINT
The predefined protocol is recommended for data communication appropriate to
the protocol of the external device, such as a measuring instrument or barcode
reader.
Communication programs using the nonprocedural protocol can be easily replaced
with those of the predefined protocol by the predefined protocol support function of
GX Works2.
With the predefined protocol, programs can be run only by starting communication
according to the specified protocol, and this can reduce the number of steps
considerably.
For the communication using the predefined protocol, refer to Chapter 9.
10