Gefran ISI Inc., Winchester, MA, offers the GFX4 and GFXtermo4 modular multiloop controllers, each of which manages 4 control loops and integrates a PID controller, power solid-state relay, current transformer, network communications, and fuse holder. Features include independent PID or on/off action; self-tuning and auto-tuning; soft start; 4 universal process inputs, 4 optional auxiliary inputs, and 2 digital inputs; and 4 integrated solid-state relays, 4 optional outputs, and 2 programmable mechanical relays. RS-485 Modbus RTU is standard and an optional fieldbus port is configurable with Modbus/TCP, ProfibusDP, CANopen, DeviceNet, or Modbus RTU.
