1746-IM16 16-Channel 265V AC Input Module Allen-Bradley

Allen-Bradley 1746-IM16 SLC 500 AC Input Module

Product Introduction

The 1746-IM16 belongs to the Allen‑Bradley SLC 500 family. This discrete input module provides sixteen input channels in a single group. Each channel supports an AC voltage range from 170V to 265V at 47‑63 Hz.

You can install this module directly into any SLC 500 chassis. It works in the local rack with the processor, in expansion racks, or as part of a distributed I/O system. The backplane draws only 0.085 Amperes at 5 Volts DC – a key low-power feature.

For signal response, the 1746-IM16 has an ON delay of 35 milliseconds and an OFF delay of 45 milliseconds. The maximum off‑state voltage is 50V AC, and off‑state current stays below 2 mA. Nominal input current is 12 mA at 240V AC. Another critical value: it handles inrush current up to 1.6 Amperes for a maximum of 0.5 ms.

Technical Specifications

The 1746-IM16 module is built for 200/240V AC general‑purpose applications. Each input channel operates independently. The module provides voltage isolation between input terminals and the logic side, tested at 1500V.

Additionally, it meets NEMA standard ICS 2‑230 for noise immunity. The module uses a removable terminal block (RTB) for wiring. Compatible RTBs include the 1746-HT and 1746-HCA.

Key electrical parameters are listed below:

• Input voltage range: 170–265V AC, 47–63 Hz

• Off‑state voltage max: 30V AC

• Off‑state current max: 2 mA

• Nominal input current: 12 mA at 120V AC

• Inrush current max: 0.8 A (some references note 1.6A peak)

• Inrush duration max: 0.5 ms

• Backplane current (5V DC): 85 mA

• Power dissipation per point: 0.35W

• Total heat dissipation: 6W

Mechanical & Environmental Ratings

The 1746-IM16 operates reliably in harsh industrial environments. Its temperature range is 0 to +60 °C (+32 to +140 °F). Storage temperature spans from -40 °C to +85 °C (-40 °F to +185 °F).

Relative humidity can range from 5% to 95% without condensation. The module withstands operational shock of 30G and vibration of 2.5G at 57‑200 Hz.

Furthermore, it holds important certifications: UL / C‑UL listed for Class I, Division 2, Groups A, B, C, D. It is also CE marked and C‑Tick marked for applicable directives.

Installation Guidelines

Installing the 1746-IM16 is straightforward. First, ensure the chassis power is off. Then insert the module into any single slot of an SLC 500 chassis. Secure it firmly.

Next, connect field wiring using an RTB such as the 1746-HT or 1746-HCA. Each input channel accepts two wires. Pay attention to the AC supply polarity because the module is designed for AC signals.

For DC input devices, use an external interposing relay. Supply AC voltage to the relay contacts. The relay then switches the DC signal safely.

Finally, power on the chassis. The processor will auto‑detect the 1746-IM16 during its I/O scan. There is no specific limit on how many modules you can install. The only limits are the processor’s I/O capacity and memory size.

Packaging List

• One Allen‑Bradley 1746-IM16 AC input module

• One removable terminal block (RTB)

• Label sheet for channel identification

• Installation instructions leaflet

Note: No certificates or warranty documents are included. Contact your supplier for warranty terms.

Shipping & Delivery

We ship all orders via FedEx, UPS, or DHL. Delivery takes 3‑7 business days depending on your region.

Frequently Asked Questions (FAQ)

1. Can the 1746-IM16 be used with 120V AC signals?
No. The 1746-IM16 requires 170‑265V AC. For 120V AC, please select the 1746-IA16 or 1746-IA8 module instead.

2. What happens if I apply DC voltage to the 1746-IM16?
The module may not detect the DC signal correctly. Use an interposing relay with an AC coil to interface DC field devices safely.

3. How many 1746-IM16 modules can a single SLC 500 processor support?
It depends on the processor model and its I/O table size. For example, the 5/03 processor supports up to 960 I/O points. Always check your processor’s user manual.

4. Why does my 1746-IM16 show a slow response?
The ON delay is 35 ms and OFF delay is 45 ms by design. This filtering prevents false triggering from electrical noise. It is normal for AC input modules.

5. Does the 1746-IM16 require external fuses?
Allen‑Bradley does not include fuses on the module. We recommend adding external fast‑acting fuses (250V, 0.2A typical) to each input circuit for protection.