Overview
The Allen-Bradley 1492-IFM20D120 is a 20-point digital interface module designed for the Bulletin 1492 programmable controller wiring system. This interface module connects Allen-Bradley PLC I/O modules to field-mounted terminal blocks using pre-wired, pre-tested cables. The 120V AC LED indicators provide immediate field-side diagnostics, enabling maintenance personnel to quickly identify faults and reduce troubleshooting time.
Key Features
- 20-Point Digital Design: Accommodates 20 field wiring terminals for both input and output connections.
- LED Voltage Indicators: 120V AC rated LED indicators provide ON-state status indication at the field side for rapid diagnostics.
- Fixed Terminal Block: Includes standard fixed terminal block configuration with extra terminals available for outputs.
- DIN Rail Mounting: Mounts directly to 35 mm DIN rail (compatible with standard rail systems) for compact control panel integration.
- Pre-Wired Cable Compatible: Works with Bulletin 1492 pre-wired cables in standard lengths (0.5, 1.0, 2.5, and 5.0 m).
- Reduced Wiring Time: Pre-tested cables and simplified terminal design minimize installation labor compared to traditional point-to-point wiring.
Technical Specifications
- Module Type: Digital Interface Module (IFM)
- I/O Points: 20
- Operating Voltage: 120V AC / 120V AC (LED indicators)
- Maximum Voltage Rating: 132V AC/DC (standard terminals)
- Mounting: 35 mm DIN Rail
- Certification: Suitable for Class I Division 2 hazardous locations (with component substitution restrictions)
- Series: Bulletin 1492
- Terminal Style: Fixed terminal block (removable terminal block [RTB] plugs available separately)
- Compatible Models: Works with Bulletin 1746, 1756, 1769, and 1771 PLC I/O modules
Typical Applications
- Industrial control panel wiring and field device interfacing in manufacturing environments
- Machine automation systems requiring reliable digital input/output signal distribution
- Factory retrofit and upgrade projects where space and wiring simplification are priorities
- Food, beverage, automotive, and discrete manufacturing automation systems
- Hazardous location environments (Class I Division 2) where documentation and compliance are critical
Compatibility & Replacements
Compatible With
- Bulletin 1746 SLC I/O modules
- Bulletin 1756 ControlLogix I/O modules
- Bulletin 1769 CompactLogix I/O modules
- Bulletin 1771 PLC-5 I/O modules
- Allen-Bradley Bulletin 1492 pre-wired cable systems
- Standard 35 mm DIN Rail mounting systems
Replaces / Drop-In Replacement For
- 1492-IFM20D120-2 (newer revision with extra output terminals)
- Earlier Bulletin 1492 20-point interface modules requiring LED indicator upgrades
Works With
- Bulletin 1492 pre-wired digital cables with screw-style or push-in terminal connectors
- Removable terminal block (RTB) plugs: 1492-RTB20N (screw) and 1492-RTB20P (push-in) — order separately, 2 per module
- Rockwell Automation Studio 5000 and legacy RSLogix software for I/O configuration
- Industrial control systems using standard discrete digital input/output logic
