1756-IB16 | Allen Bradley | ControlLogix Series 16-Channel DC Input Module

Product Description

The 1756-IB16 digital input module from Allen Bradley’s ControlLogix series is designed for reliable acquisition of DC signals in industrial automation systems. With sixteen inputs arranged in two groups of eight, it supports 12/24 VDC sinking inputs and provides configurable filter times for noise reduction. Its compact single-slot design and robust isolation make it suitable for demanding control applications.

Technical Specifications

• Manufacturer: Allen Bradley

• Product Line: ControlLogix

• Part Number: 1756-IB16

• UPC: 612598164509

• Category: PLC Input Module

• Module Type: Digital DC Input (Sinking)

• Number of Inputs: 16 (two groups of 8)

• Nominal Input Voltage: 24 VDC

• Operating Voltage Range: 10–31.2 VDC

• ON-State Current: 2 mA @ 10 VDC (min), 10 mA @ 31.2 VDC (max)

• OFF-State Voltage (max): 5 VDC

• OFF-State Current (max): 1.5 mA

• Input Delay Times:

• OFF → ON: 290 µs nominal / 1 ms max + user-selectable filter (0, 1, or 2 ms)

• ON → OFF: 700 µs nominal / 2 ms max + user-selectable filter (0, 1, 2, 9, or 18 ms)

• Cyclic Update Time: 200 µs to 750 ms

• Timestamp Accuracy: ±200 µs

• Inrush Current: 250 mA peak (decays to <37% in 22 ms)

• Input Impedance: 3.12 kΩ @ 31.2 VDC

• Backplane Current Draw:

• 100 mA @ 5.1 VDC

• 2 mA @ 24 VDC

• Total Backplane Power: 0.56 W

• Power Dissipation (max): 5.1 W @ 60 °C (140 °F)

• Thermal Dissipation: 17.39 BTU/hr

• Isolation Voltage: 250 V continuous (basic insulation, inputs-to-backplane and group-to-group); routine tested at 1350 V AC for 2 s

• Module Keying: Electronic, software configurable

• RTB Keying: User-defined mechanical

• Slot Width: Single slot

• Wire Category: 1

• Temperature Codes: North America T3C / IEC T3

• Enclosure Type: Open-style

• Reverse Polarity Protection: Yes

• Weight: 0.44 lbs (0.20 kg)

Key Features

• Sixteen DC sinking inputs with configurable filter times.

• High-speed response with timestamp accuracy for event logging.

• Robust isolation between input groups and backplane.

• Compact single-slot design for ControlLogix chassis.

• Reverse polarity protection for added reliability.

Application Scenarios

• Machine control systems requiring multiple DC inputs.

• Distributed automation systems with event timestamping.

• Process control environments needing configurable input filtering.

FAQ

Q: What type of inputs does the 1756-IB16 support?   A: It supports 12/24 VDC sinking inputs across a 10–31.2 VDC operating range.

Q: How does this differ from the 1756-IB16I?  A: The 1756-IB16 groups inputs, while the 1756-IB16I provides individually isolated inputs for enhanced signal separation.

Q: What terminal blocks are compatible?  A: The module supports 1756-TBNH and 1756-TBSH removable terminal blocks.