This Centipede 2® STACK operator interface unit monitors and edits up to 512 modules/zones and displays actual temperature, RTD status, set-point, high-limit alarm setting, low-limit alarm setting and power duty cycle of each heater. It gives the user the ability to change settings individually or globally across system. It can communication with PLC or external computer through Modbus RTU over RS-232C, local User Interface (LUI) over RS-232C, or Telnet over Ethernet. The dry contact master alarm relay can be set to normally open (NO) or normally closed (NC). LEDs indicate status for main power, alarms and internal/external communication links. It has two fuses including a 250VAC 20amp rated fuse and a mini-fuse (5 x 20mm) for fast blow. Installs on 35mm standard DIN-Rail. Dimensions (H x W x D): 4.5 x 1.8 x 3.9in (115 x 45 x 99mm). Temperature Setting Range: 0 To 325°C. Universal Input Voltage: 100 To 240V. Amperage: Up To 20A. BriskHeat® #: C2STACK-OI.