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1 FUNCTIONS
1.8 Link Dedicated Instruction Communication
1.8 Link Dedicated Instruction Communication
The link dedicated instructions are used to exchange random data between another network or other station's CPU module
connected to Ethernet, read/write arbitrary data, and access other stations such as remote RUN/STOP. If the initial processing
for the RJ71EN71 or the RnENCPU (network part) of the own station, relay station, and access station are completed
normally, the other station can be accessed with the link dedicated instructions.
This section describes the procedure for accessing a CPU module in another station on the same Ethernet line.
When exchanging data with a different network, refer to the following.
( Page 385 Communications with Different Networks)
Precautions
The CPU module (CPU part for the RnENCPU) cannot exchange data with the link dedicated instruction.
Applicable dedicated instructions
Shows the link-dedicated instructions used for data communication.
For details on link dedicated instructions, refer to the following.
MELSEC iQ-R Programming Manual (Module Dedicated Instructions)
Instruction Description
SEND Sends data to another station.
RECV Reads the receive data from another station. (for main program)
RECVS Reads the receive data from another station. (for interrupt program)
READ Reads data from the word device of another station.
SREAD Reads data from the word device of another station. (with completion device)
WRITE Writes data in the word device of another station.
SWRITE Writes data in the word device of another station. (with completion device)
REQ Requests the remote RUN/STOP to the CPU module on another station.
Reads/writes clock data from/to another station.
ZNRD Reads data from the word device in another station (ACPU).
ZNWR Writes data in the word device in another station (ACPU).
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