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1746-IM4

Allen-Bradley 1746-IM4 SLC 500 | 4-Point AC Input Module 240V

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  • Manufacturer: Allen-Bradley

  • Product No.: 1746-IM4

  • Product Type: AC Input Module

  • Product Origin: USA

  • Payment:T/T, Western Union

  • Weight: 320g

  • Shipping port: Xiamen

  • Warranty: 12 months

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Beskrivelse

Product Overview

The Allen-Bradley 1746-IM4 is a 4-channel Digital AC Input Module for the SLC 500 PLC system. It accepts 170-265V AC signals from field devices such as limit switches, pushbuttons, and proximity sensors. This module mounts directly into the 1746 I/O chassis, providing reliable AC input monitoring for general-purpose industrial control applications.

Core Functionality

The 1746-IM4 converts 200-240V AC field signals into logic-level inputs for the SLC 500 processor. Each of the four input channels features a nominal input current of 12mA at 240V AC. Signal delay times are 35ms for ON transitions and 45ms for OFF transitions. Off-state leakage current is limited to 2.0mA maximum, preventing false triggering. Circuit isolation is tested at 1500V AC between the backplane and I/O, protecting the control system from field-side faults.

Technical Specifications

Parameter Value
Part Number 1746-IM4
Series SLC 500
Module Type Digital AC Input Module
Inputs 4
Voltage Range 170-265V AC (47-63 Hz)
Nominal Input Current 12mA @ 240V AC
Backplane Current (5V DC) 35 mA
Backplane Current (24V DC) 0 A
ON Signal Delay 35 ms (max)
OFF Signal Delay 45 ms (max)
Off-State Leakage Current 2.0 mA (max)
Off-State Voltage Loss 50V AC (max)
Surge Current per Point 1.6A (500µs duration)
Power Dissipation 1.6W
Isolation (Backplane to I/O) 1500V AC
Weight Approx. 0.32 kg (0.7 lbs)
Operating Temperature 0°C to 60°C (32°F to 140°F)
Storage Temperature -40°C to 85°C (-40°F to 185°F)
Humidity 5-95% (non-condensing)
Shock Rating 30G
Vibration Rating 2.5G (57-500 Hz)
Certifications UL-A196, CSA, C-UL (hazardous locations)
Noise Immunity NEMA ICS 2-230

Installation Guide

Install the 1746-IM4 in any available slot of the SLC 500 1746 I/O chassis. Ensure the chassis is powered off before insertion. Align the module with the card guides and push firmly until the connector seats fully with the backplane. Secure the module with the retaining screw. Connect field wiring using 1746-HT or 1746-HCA I/O connection cables. Observe polarity: AC inputs are not polarity-sensitive but maintain consistent wiring practices for troubleshooting.

Engineering Advantages

The 1746-IM4 provides reliable AC input monitoring with 1500V AC isolation, protecting the SLC 500 backplane from field-side transients. The 35ms ON and 45ms OFF delays filter contact bounce and electrical noise, ensuring stable input states. Off-state leakage current of just 2.0mA prevents false triggering from residual current in long cable runs. The module is rated for 30G shock and 2.5G vibration, making it suitable for heavy machinery environments. UL and CSA certifications allow installation in hazardous locations. The lightweight design at approximately 0.32 kg (0.7 lbs) simplifies installation and reduces chassis loading.

Technical FAQs

Q1: Can the 1746-IM4 accept 120V AC inputs?
A1: No. The 1746-IM4 is designed for 170-265V AC (200-240V AC nominal). For 120V AC inputs, use the 1746-IA4 or 1746-IA8 module instead.

Q2: What is the purpose of the 35ms ON delay?
A2: The ON delay filters electrical noise and contact bounce from mechanical switches, preventing false transitions and ensuring stable processor input states.

Q3: Is the 1746-IM4 compatible with 1746 chassis of any series?
A3: Yes. The 1746-IM4 works with all SLC 500 1746-series chassis, including the 1746-A4, A7, A10, and A13 models.

Product Resources

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🏷️ Tags: AC Input Module

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