Allen‑Bradley 1492-IFM20F-FS-2 – Isolated Fusible Digital Interface Module

Specifications

• Connector: 20-pin ribbon cable connector, compatible with 16-point digital I/O modules (ControlLogix/FLEX I/O)
• Circuit Protection: Built-in 5×20mm fuse holders per channel (fuses not included)
• Circuit Rating: 2 A per single I/O circuit; max 12 A total per module
• Operating Voltage: 0–132 VAC / VDC universal signal range
• Field Terminals: Dual screw terminals per I/O point (two terminals per channel)
• Wire Gauge: 12–22 AWG solid/stranded copper wire
• Isolation Design: Split isolated power bus (two groups of 10 channels) for separate power supply references
• Mounting: Standard 35 mm DIN rail mounting
• Operating Temperature: 0 °C ~ +60 °C
• Humidity: 5%–95% RH, non-condensing
• Weight: Approx. 0.24 kg
• Certifications: UL/cULus, CE, CSA, NRTL

Key Features

1. On-board fusible protection
    
   Independent fuse clip for each channel, provides individual overcurrent protection for sensor/actuator field wiring, avoids full I/O branch shutdown from single short circuit.
2. Isolated dual-bus structure
    
   Divides channels into two isolated banks, supports two different power sources for input/output circuits without cross-interference.
3. Dual field terminals per channel
    
   Extra terminal positions simplify power bus daisy-chaining for output loads, reduces auxiliary terminal block usage in cabinets.
4. Keyed locking cable connector
    
   Prevents miswiring of PLC ribbon cables, secure latch design resists vibration loose connection.
5. Transparent safety cover
    
   Covers fuse area to prevent accidental contact while allowing visual fuse inspection without disassembly.
6. High-density compact layout
    
   Conserves cabinet space, standardizes field wiring for distributed FLEX I/O and ControlLogix digital modules.
7. No blown-fuse indicator base model (FS variant without LED status lights)

Applications

• Field wiring termination for 16-point digital input/output PLC modules (1794 FLEX I/O, 1756 ControlLogix)
• Discrete sensor (proximity, photoelectric, limit switch) and actuator solenoid/valve wiring
• Packaging, automotive, material handling machinery with individual circuit short-circuit protection
• Industrial control panels requiring separated power domains for input and output signals