MITSUBISHI ELECTRIC QJ71C24N - Manual (Page 121)

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6 DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL
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6 DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL
Data communication using the non procedure protocol is a function for sending and
receiving data between a PLC CPU and an external device using the message format
and transmission control procedure specified by the user.
Data can be transferred using the non procedure protocol when it is necessary to
perform data communication using the protocol for external devices such as a
measuring instrument and a bar code reader. In that case, transmission/receive data
processing can be simplified by using the communication functions with the user
frames described in the User's Manual (Application).
This chapter explains the basic transmission and reception methods when performing
data communication using the non procedure protocol.
Follow the procedure described in this chapter to create sequence programs for
sending and receiving data for the PLC CPU.
For details on the additional functions listed below for data communication using the
non procedure protocol, see the separate User's Manuals (Application).
• Sending/receiving data using user frames (See Chapter 11, Application)
• Monitoring the PLC CPU (automatic information function)
(See Chapter 2, Application)
• Switching modes from the PLC CPU (See Chapter 15, Application)
• Reading received data using interrupt programs (See Chapter 4, Application)
• Sending/receiving data using transparent code designation
(See Chapter 12, Application)
• Sending/receiving data using ASCII data (ASCII-BIN conversion)
(See Chapter 13, Application)
• Controlling half-duplex communication (See Chapter 8, Application)