ControlLogix DC Output Module | 1756-OB16I | Allen-Bradley

Overview

The 1756-OB16I is a 16-point DC output module designed for Allen-Bradley ControlLogix systems. Each output is individually isolated, ensuring reliable operation and protection across control circuits. This module delivers precise switching performance for industrial DC loads, featuring fast response times, configurable electronic keying, and full compatibility with ControlLogix backplanes.

Technical Specifications

• Manufacturer: Allen-Bradley

• Model / Part Number: 1756-OB16I

• Module Type: DC Output Module, ControlLogix Series

• Outputs: 16 individually isolated channels

• Pilot Duty: 2 A (DC-13 SQ)

• Voltage Category: 12/24V DC sink/source

• Operating Voltage Range: 10–30V DC

• Output Switching Times:

• Off-to-On: 1 ms max

• On-to-Off: 2 ms max

• Current Draw: 350 mA @ 5.1V, 2.5 mA @ 24V

• Backplane Power Consumption: 1.8 W

• Maximum Power Dissipation: 3.6 W @ 60°C, Thermal Dissipation 12.28 BTU/hr

• Off-State Leakage: Max 0.5 mA per point

• On-State Voltage Drop: Max 1.2 V @ 2 A

• Current per Point: 2 A @ 30°C; 1 A @ 60°C (linear derating)

• Current per Module: 8 A @ 30°C; 4 A @ 60°C (linear derating)

• Surge Current per Point: 4 A for 10 ms, repeatable every 2 s

• Minimum Load Current: 1 mA per point

• Scheduled Outputs: Synchronization within 16.7 s max (reference to Coordinated System Time)

• Output States in Fault/Program Mode: Hold last state, configurable On/Off

• Isolation Voltage:

• Outputs-to-Backplane: 250 V continuous, basic insulation

• Output-to-Output: 125 V continuous, basic insulation

• Tested at 1350 V AC for 2 s

• Module Keying: Electronic, software configurable

• Fusing: Not included; fused IFM recommended

• Removable Terminal Block Compatibility: 1756-TBCH, 1756-TBS6H

• RTB Keying: User-defined mechanical

• Slot Width: 1

• Wire Category: 1

• Temperature Codes: North American T4A, IEC T4

• Enclosure: Open-style, no housing

Application Notes

• Suitable for DC load control, pilot duty applications, and automated machine systems

• Compatible with ControlLogix backplane for seamless integration

• Ideal for high-reliability industrial switching with isolated outputs

FAQ

Q: How many outputs does the 1756-OB16I provide?
A: 16 individually isolated DC output points.

Q: What is the maximum current per channel?
A: 2 A at 30°C, derated to 1 A at 60°C.

Q: Is the module isolated from the backplane and between outputs?
A: Yes, outputs-to-backplane and output-to-output isolation is provided.