Communication protocol: Modbus(RTU), Modbus TCP
Communication parameter: baud rate(BPS),Data bits, Stop bits,
Parity， Overtime(response timeout)
Comm Type: Ethernet, RS232 or RS485( Communication interface of PLC )
Data register Index: High Low /Low High
Command: 01 Read coils
02 Read Discrete input
03 Read Holding Registers
04 Read Input Registers
15 Write Multiple Coils
16 Write Multiple Registers
Register start address, count.
Q is set or reset depending on the communication status.
Successful communication , Q=1;
Failed communication ,Q=0;
Regarding of the RS232/RS485 comm type, you can refer to the instructions of Modbus read or Modbus
Write block. Here only explain how to use the Ethernet comm type.
The Property in dialog box of Modbus Read Write shows as below figure:
The CPU can be worked as client or server when you want to make it as a master. We only need make the
TCP/IP connection successfully first, then enable the block, the configured data will be transferred
through the Tcp connection.
Option A. Local CPU works as client
If the CPU works as the client, so we need know which server will be connected, so you need select the
Remote option (1--8) for the server address. This option is based on the network settings from the
menu Tools-> transfer->Web Server Config
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