Allen-Bradley 1756-IB16 | ControlLogix 24V DC Input Module

Allen-Bradley ControlLogix 16-Point DC Input Module 1756-IB16

The Allen-Bradley 1756-IB16 is a reliable 16-point sinking DC input module for ControlLogix systems. It operates on a wide voltage range and is designed for robust industrial sensing applications. The module features configurable filtering and supports fast Change of State (COS) responses.

Core Specifications

• Brand & Model: Allen-Bradley 1756-IB16
• Series: ControlLogix Discrete I/O Module
• Type: 16-Point Sinking DC Input
• Nominal Voltage: 24V DC
• Operating Voltage Range: 10 – 31.2V DC
• On-State Current: 2 mA @ 10V DC to 10 mA @ 31.2V DC
• Off-State Current (Max): 1.5 mA
• Backplane Current: 120 mA @ 5.1V DC, 2 mA @ 24V DC
• Power Dissipation: 5.1 Watts Max @ 60°C
• Isolation Voltage: 250V Continuous

Performance & Timing

• Input Delay (OFF to ON): 290 µs typical / 1 ms max + filter time.
• Input Delay (ON to OFF): 700 µs typical / 2 ms max + filter time.
• Maximum Inrush Current: 250 mA peak (decays in 22 ms).
• Grouping: 16 points divided into 2 groups of 8 for diagnostic purposes.
• Electronic Keying: Ensures module compatibility and prevents mismatches.

Installation & Compatibility

• Terminal Blocks: Compatible with 20-pin 1756-TBNH (screw) or 1756-TBSH (spring clamp).
• Chassis: Installs in any 1756 ControlLogix local or remote chassis slot.
• AC Signal Use: Requires external interposing relay or circuitry for AC input voltages.
• Wiring: Follow standard 24V DC sinking input practices; ensure proper grounding.

Physical & Environmental

• Thermal Dissipation: 21.1 BTU/hour @ 60°C (140°F)
• Operating Temperature: 0° to 60°C (32° to 140°F)
• Slot Width: 1 Slot
• Status Indicators: Per-point and module status LEDs for diagnostics.

Packaging & Shipping

• One Allen-Bradley 1756-IB16 input module.
• Secure, industrial packaging.
• Shipped via FedEx, UPS, or DHL.

FAQ

• What does "sinking input" mean?
  It means the module provides a path to ground (-). The field device (e.g., sensor) must source current (+24V) to the input point to activate it.
• Can I use this module with 120V AC sensors?
  Not directly. You must use an interposing relay or signal conditioner to convert the AC signal to a compatible DC level.
• What is Change of State (COS) and why is it useful?
  COS allows the module to immediately notify the controller of an input change, bypassing the normal scan cycle for faster response to critical events.