1 Introduction 1-1 Introduction 1-1-1 Features Modbus TCP Slave/Server Mode The adapter allows a PLC to act as a Modbus TCP slave device. The adapter will respond to Modbus TCP commands from another master device using the Modbus TCP protocol. The following functions are supported. • Read Coil Status • Read Input Status • Read Holding Registers • Read Input Registers • Write Single Coil • Preset Single Register • Write Multiple Coils • Preset Multiple Register Modbus TCP Master/Client Mode The adapter allows a PLC to act as a Modbus TC P master device. The adapter will initiate Modbus TCP commands and process responses to other slave devices using the Modbus TCP protocol.
The adapter mounts in the Option Board Slot on the front of a CP1L or CP1H PLC, and can be used in all CP1L / CP1H PLCs with an available Option Board Slot. A CP1L or CP1H PLC with 2 option board slots can use 2 CP1W-MODTCP61 adapters, with one functioning as a Modbus TCP Master / Client and one functioning as a Modbus TCP Slave / Server. The adapter mounts in the Option Board Slot on the front of a CJ2M-3 □ PLC. When used in a CJ2M series PLC, the adapter will only function as a Modbus TCP Slave / Server. 1-2 Grid Connect Modbus/TCP Adapter Application and Setup Guide PLC Option Board Slot Mounting