2 Operation 2-3 Operation Modes The CP1W-MODTCP61 adapter can operate in Modbus TCP Slave/Server or in Modbus TCP Mas- ter/Client mode when mounted in a CP1 series PLC. When mounted in a CJ2M PLC, the adapter can only operate in Modbus TCP Slave/Server mode. The operating mode is selected with the web browser configuration method detailed in 2-2-1 Configur- ing the Adapter . Select Modbus TCP Slave/Server Mode or Modbus TCP Master/Client Mode and click Apply Setting to save the configuration.
2-3-1 Modbus TCP Slave/Server Mode When configured for Modbus TCP Slave/Server mode, the adapter functions as a slave node allowing a Modbus TCP Master/Client device to send commands to and receive responses from the adapter. A Modbus Master device could be a PC with software that use the Modbus TCP protocol, as well as PLCs and other hardware devices functioning as Modbus TCP masters. See 2-1-1 PLC Setup for more information on PLC setup and switch configuration. The adapter supports the following Modbus function codes. Additional Information The adapter uses the standard Modbus/TCP port 502.
Grid Connect Modbus/TCP Adapter Application and Setup Guide 2-9 Modbus Function Code Description 01 Read Coil Status 02 Read Input Status 03 Read Holding Registers 04 Read Input Registers 05 Write Single Coil 06 Preset Single Register 0F Write Multiple Coils 10 Preset Multiple Register