170NEF... Series Modbus Plus Communication Adapters
These communication adapters can be connected to any TSX Momentum I/O base to create a functional I/O module. They provide a direct connection to the Modbus Plus network, enabling a programmable controller to communicate with field devices wired to the I/O base terminals. Data bits are transferred in the 984 formats. Model 170 NEF 110 21 provides one Modbus Plus port for single-cable networks. Model 170 NEF 160 21 has two ports for single-cable or dual-cable networks.