2 Operation 2-4 Applications 2-4-1 Modbus TCP Slave/Server Applications The CP1W-MODTCP61 allows Omron CP1L , CP1H, and CJ2M-CPU3 □ PLCs to function as program- mable I/O modules. The adapter is a Mo dbus/TCP slave device, meaning the adapter cannot establish a connection to another device. A device, such as a PC o r PLC, functioning as Modbus/TCP Master, must be the device used to establish the TCP connection and control the communications to the CP1W- MODTCP61. When using the adapter in Modbus TCP Slave/Server mode, the adapter will also function as a FINS slave device, allowing the use of an NS-Series HMI and/or CX-Programmer programming software.
Up to 2 Modbus TCP Master/Client devices can communicate simultaneously with the adapter, in addi- tion to 2 FINS devices. When using Modbus TCP clients to connect to the PLC through the CP1W-MODTCP61, the client will be automatically disconnected after 30 seconds of inactivity to allow other clients to connect. To main- tain a TCP connection from a client, send at least 1 command at intervals of less than 30 seconds. 2-12 Grid Connect Modbus/TCP Adapter Application and Setup Guide