7DATA COMMUNICATION USING THE BIDIRECTIONAL PROTOCOL
Data communication using the bidirectional protocol is a function for sending/receiving any data using the message format and transmission control procedure for the Q series C24 bidirectional protocol between external devices and PLC CPUs.
Any external devices that can install application programs and transmit and receive data in accordance with the MELSEC PLC protocol can communicate with the PLC CPUs using the bidirectional protocol.
This chapter explains the basic transmission and reception methods when performing data communication using the bidirectional protocol.
Follow the procedure described in this chapter to create sequence programs for sending and receiving data for the PLC CPU.
Regarding the additional functions listed below for data communication using the bidirectional protocol, see the separate User's Manuals (Application)
• Reading receive data using interrupt programs
(See Chapter 4 of Application)
• Sending/receiving data using ASCII data
(See Chapter 13 of Application)
• Sending/receiving data using transparent code designation
(See Chapter 12 of Application)
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