1756-IM16I | Allen-Bradley ControlLogix 16-Point 240V AC Isolated Input Module

Overview

The Allen-Bradley 1756-IM16I is a high-performance 16-point isolated digital AC input module from the ControlLogix family. Each input channel is individually isolated to ensure superior noise immunity and reliable operation in demanding industrial environments. The module supports 240V AC nominal input signals at 50/60 Hz, making it ideal for interfacing with standard industrial control devices.

Technical Specifications

• Model / Part Number: 1756-IM16I

• Brand: Allen-Bradley

• Product Line: ControlLogix

• Product Type: Digital AC Input Module

• Number of Inputs: 16 individually isolated channels

• Voltage Category: 240V AC, 50/60 Hz

• Operating Voltage Range: 159–265V AC, 47–63 Hz

• Nominal Input Voltage: 240V AC, 50/60 Hz

• Current Draw:

• 5.1V DC: 100 mA

• 24V DC: 3 mA

• Backplane Power: 0.58 W

• Power Dissipation (max): 5.8 W @ 60°C (140°F)

• Thermal Dissipation: 19.78 BTU/hr

• Input Delay Time:

• Off → On: 10 ms hardware + 1 or 2 ms filter (selectable)

• On → Off: 8 ms hardware + 9 or 18 ms filter (selectable)

• Off-State Voltage (max): 40V AC

• Off-State Current (max): 2.5 mA

• On-State Current:

• Minimum: 5 mA @ 159V AC, 60 Hz

• Maximum: 13 mA @ 265V AC, 60 Hz

• Input Impedance (max): 20.38 kΩ @ 265V AC, 60 Hz

• Inrush Current (max): 250 mA

• Isolation Voltage:

• 250V AC continuous (basic insulation type)

• Tested at 1350V AC for 2 seconds (input-to-backplane and input-to-input)

• Cyclic Update Time: 200 μs to 750 ms (software configurable)

• Change of State Detection: Software configurable

• Timestamp Resolution: ±200 μs

• Compatible Terminal Blocks: 1756-TBCH or 1756-TBS6H (removable)

• RTB Keying: User-defined mechanical keying

• Slot Width: 1

• Enclosure Type: Open-style (for panel-mounted ControlLogix chassis)

• Temperature Code:

• North American: T4

• IEC: T4

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Vibration: 10–500 Hz, 2 g peak

Key Features

• 16 fully isolated 240V AC input channels for maximum signal integrity

• Configurable software filtering for improved noise rejection

• Time-stamped input change detection for precision data logging

• High isolation voltage for protection against transient surges

• Compatible with standard ControlLogix chassis and removable terminal blocks

Applications

• Power distribution and monitoring systems

• Industrial automation and machine control

• Input interfacing for AC sensors, switches, and actuators

• Control panels requiring isolated input signals

FAQs

Q1: What makes the 1756-IM16I different from non-isolated input modules?
Each input channel on the 1756-IM16I is individually isolated, reducing ground noise and minimizing interference in sensitive automation systems.

Q2: What removable terminal blocks can be used with this module?
The 1756-IM16I is compatible with both 1756-TBCH and 1756-TBS6H removable terminal blocks.

Q3: How is the input filter configured?
Filter times (1/2 ms or 9/18 ms) are user-selectable via software, allowing optimization for fast or noise-prone environments.