Allen Bradley 1756-IA16I ControlLogix 16-Point Isolated AC Input Module

Product Overview

The Allen Bradley 1756-IA16I functions as a high-density digital input interface for ControlLogix chassis. This 100% brand new original module provides sixteen independent channels, each featuring individual galvanic isolation. This architecture allows the module to interface with various AC field devices across different phases or power sources, ensuring maximum signal separation and system stability in complex industrial environments.

Technical Specifications

• Manufacturer: Allen Bradley

• Series: ControlLogix

• Module Type: Digital AC Input

• Number of Inputs: 16 Individually Isolated

• Nominal Input Voltage: 120 Volts AC

• Operating Voltage Range: 79 to 132 Volts AC (47–63 Hz)

• Off-State Current (Max): 2.5 mA

• Backplane Current (5V): 125 mA

• Backplane Current (24V): 2 mA

• Power Dissipation: 4.9 Watts maximum @ 60 °C

• Input Delay Time: Programmable (9 ms or 18 ms)

• Electronic Keying: Software Configurable

• Compatible RTBs: 1756-TBCH, 1756-TBS6H

Engineering Advantages

• Superior Individual Isolation: Unlike standard grouped input modules, the 1756-IA16I isolates every channel. This eliminates the risk of ground loops and allows the connection of field devices powered by different AC voltage sources or phases within a single module.

• Programmable Signal Filtering: Engineers can select 9 ms or 18 ms delay times to filter out mechanical contact bounce or electrical noise. This customization ensures that the controller receives only valid state changes, improving process accuracy.

• Electronic Keying System: The module utilizes electronic keying to prevent the accidental insertion of the wrong module type into a configured slot. This safeguards the system during maintenance and prevents hardware damage due to mismatched voltages.

• Simplified Field Wiring: The module supports the 1756-TBCH and 1756-TBS6H Removable Terminal Blocks (RTBs). This feature allows technicians to replace the module without disconnecting individual field wires, significantly reducing MTTR (Mean Time To Repair).

FAQs

• Is this 1756-IA16I module a brand new original unit?

  Yes, we provide only 100% brand new and original Allen Bradley hardware in factory-sealed packaging to ensure full operational lifespan and compliance.

• Does this module require a specific terminal block?

  Yes, you must use a 36-pin Removable Terminal Block, specifically the 1756-TBCH (cage clamp) or 1756-TBS6H (spring clamp).

• Can I mix different AC phases on the same module?

  Because the 1756-IA16I features individual isolation for every channel, you can safely connect inputs from different AC phases or separate power sources to the same module.

• How does electronic keying work during replacement?

  The controller identifies the module upon insertion. If the module type or revision does not match the software configuration, the system prevents communication to protect your hardware.