Description

1492-IFM40DS24A-4 Allen‑Bradley 40-Point Isolated Digital IFM Interface Module

Technical Specifications

• Product Model: 1492-IFM40DS24A-4
• Brand: Allen‑Bradley (Rockwell Automation)
• Warranty: One Year
• Input Voltage: 24V/48V AC/DC for LED indicator power supply
• Operating Temperature: -20°C to +60°C continuous cabinet operation
• Storage Temperature: -40°C to +85°C
• Response Time: Passive wiring terminal module with zero signal delay
• Protection Class: IP20 indoor control cabinet DIN rail mounted enclosure
• Accuracy Class: N/A (Pure signal wiring breakout accessory)
• Output Frequency: No signal conversion, only passive circuit distribution
• Rated Current Range: Screw terminals support 22–12 AWG wire, rated for standard PLC digital I/O loop current
• Communication Interface: 40-pin ribbon cable connector for PLC I/O module; field side 4 screw terminals per I/O channel
• Supported Protocols: Compatible with 1756 ControlLogix, 1746 SLC500, 1771 PLC‑5 digital I/O modules
• Overload Capacity: Built-in freewheeling diode surge suppression for inductive load back EMF protection, per-channel short-circuit isolation
• Dimensions: Standard DIN rail compact housing, finger-safe terminal design
• 

Product Overview

The 1492-IFM40DS24A-4 is a Bulletin 1492 series isolated digital interface terminal block manufactured by Rockwell Automation, serving as a professional wiring breakout adapter for Allen‑Bradley PLC digital input and output modules. This DIN‑rail mount unit converts the dense 40‑pin ribbon cable plug of PLC I/O cards into independent screw terminal points, with 4 spare field terminals allocated for each single I/O channel to facilitate parallel wiring, signal tapping and convenient multimeter testing on site. It is equipped with 24V AC/DC LED status indicators for real-time visual feedback of on/off signal states, and integrated isolation diodes to absorb voltage spikes generated by solenoids, relays and other inductive field loads.

This module solves core cabinet wiring pain points such as messy bundled ribbon cable routing, high probability of wiring errors during commissioning, difficult point-by-point troubleshooting without test taps, and premature PLC I/O channel burnout caused by inductive load reverse voltage kickback. Automation panel builders, electrical maintenance technicians, OEM machine designers and system integrators for packaging equipment, process production lines and material handling systems greatly improve wiring standardization and fault diagnosis efficiency with this Allen‑Bradley interface module. The finger‑safe terminal structure complies with IEC safety requirements to prevent accidental electric shock, while the fixed terminal block eliminates loose wire risks under long-term equipment vibration.