MODBUS TCP Master/Slave Communication
• Specify the connection No. targeted for communication, using UNITSEL
command immediately before SEND/RECV command.
• Master communication is only valid when MEWTOCOL or MODBUS is
selected. Confirm that the "clear to send master communication flag" (X90 -
X9F) for the targeted connection is ON, and execute SEND/RECV command.
• You cannot execute other SEND/RECV command for connection in master
communication. Confirm that the "sending master communication flag"
(Y90 - Y9F) is OFF, and execute command.
• You cannot execute SEND/RECV command for connection in slave
communication.
• Up to 16 SEND/RECV commands can be executed simultaneously for
different connections.
• In the MODBUS-TCP mode, specify the partner station no. for the operand
of SEND/RECV command.
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