Communication Type Of Protocols - Mitsubishi Electric MELSEC iQ-R Series User Manual

2.2

Communication Type of Protocols

A send packet to the target devices and a receive packet from the target devices at the time of process execution are
registered in a protocol.
The packet elements which are set to the Predefined protocol support function is applied to the actual data portion of the
packet to be transmitted.
For details of packet elements, refer to the following section.
Page 35 Packet elements
Ex.
Example of a packet configuration
Header Station No.
With the Predefined protocol support function, communications with target devices are performed using the following
procedures (communication types).
Communication Processing
type name
Send Only Sends a send packet once.
One send packet is required.
Receive Only Receives a packet if it matches any of up to 16 defined receive packets.
One or more receive packets are required.
Send & Receive Sends a send packet, and then receives a packet if it matches any of up to 16 defined receive packets.
One send packet and one or more receive packets are required.
For the operation of each operation type, refer to the following section.
Page 521 Operation Image and Data Structure of Predefined Protocol
2 DATA COMMUNICATION USING PREDEFINED PROTOCOL
34
2.2 Communication Type of Protocols
Number of byte
Command
to be read
Maximum data length: 2048 bytes
Data area
Read data Check code Terminator