Mitsubishi MELSEC LJ71C24, Руководство пользователя

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9 DATA COMMUNICATION USING THE PREDEFINED PROTOCOL
9.2 Communication Type of Protocols
Send packets to other devices and receive packets from other devices at the time of
process execution are registered in a protocol.
The following shows an example of a packet configuration. For details of packet
elements, refer to Section 9.3.
Length of
read data
Read data Header Station No. Command Terminator Check code
Data division
Maximum length: 2048 bytes
The predefined protocol function communicates with other devices using the following
procedures (communication types). For the operation image of each communication
type, refer to Appendix 5.
Communication
type name
Description
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.