1756-OB16 | Allen Bradley ControlLogix 16-point Digital Output Module

Product Summary

The 1756-OB16 is a ControlLogix 16-point digital output module. It provides 16 sourcing (positive logic) 24 VDC outputs for discrete control applications in ControlLogix systems.

Core Specifications

• Catalog Number: 1756-OB16
• Module Type: 16-Point Digital Output Module (24 VDC Sourcing)
• Compatible Platform: ControlLogix (1756 chassis)
• Output Points: 16 (one group of 16)
• Rated Voltage: 24 VDC
• Output Current: 2 A per point, 8 A per module (resistive)

Electrical Characteristics

• On-State Voltage Drop: Maximum 200 mV
• Surge Current: 4 A for 10 ms, repeatable every 1 s
• Isolation: 250 V continuous / 1500 V for 1 minute (group-to-backplane)
• Diagnostics: Output verification and fault reporting available
• Backplane Current: ~100 mA @ 5 VDC, ~2 mA @ 24 VDC (typical)

Installation Guide

1. Install the module in any slot of a 1756 ControlLogix chassis.
2. Use a removable terminal block (RTB) for field wiring (1756-TBCH or 1756-TBS6H recommended).
3. Configure the module in Studio 5000 Logix Designer for output behavior and diagnostics.
4. Verify operation using module status LEDs and controller diagnostics.

Selection Guidelines

• Select 1756-OB16 for standard 24 VDC sourcing digital outputs without individual isolation or electronic fusing.
• For fused or isolated versions, consider 1756-OB16E or 1756-OB16IEFS.
• Ensure chassis power supply capacity supports the module’s backplane current draw.

Frequently Asked Questions