Setting and Operation of User Connection
4.2 Communication Processing
4.2.1 Communication Operation
Operation following connection
• Once connection is established, PLC and devices can communicate in the respectively
specified operation mode.
• By default, the FP7 CPU unit is set to enable slave communication.
• When master communication is to be performed from the FP7 CPU unit to devices, use the
dedicated commands SEND/RECV. When general-purpose communication is to be
performed, use GPSEND/GPRECV commands.
• In the case of master communication commands (SEND/RECV), PLC automatically
generates communication formats that support the protocol for each communication mode
(MEWTOCOL-DAT, MEWTOCOL-COM, MODBUS TCP).
• When commands are sent from a higher device to the FP7 CPU unit, in communication
formats that support the protocol for each communication mode (MEWTOCOL-DAT,
MEWTOCOL-COM, MODBUS TCP), data are sent attached with the Ethernet header as
necessary (to be selected by protocol or by partner). Here, the FP7 CPU unit responds
automatically, so no program concerning communication is necessary on the PLC side.
Confirm sending/reception of each communication
• When communication is performed from the FP7 CPU unit and devices, the operation
devices (X, Y) allocated to built-in ET-LAN are used for confirming reception, reading data,
and/or confirming sending completion.
• Relevant flags are allocated to Device No. X70 - X9F and Y70 - Y9F.
4-4
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