1756-OB16IEFS | Allen Bradley ControlLogix 16-point Digital Output Module

Product Summary

The 1756-OB16IEFS is a ControlLogix 16-point digital output module with electronic fusing and Sequence of Events (SOE) timestamping. It provides 16 individually isolated 24 VDC sourcing outputs with advanced diagnostics and high-resolution timestamping for critical event recording.

Core Specifications

• Catalog Number: 1756-OB16IEFS
• Module Type: 16-Point Isolated Digital Output Module (24 VDC) with Electronic Fuse and SOE
• Compatible Platform: ControlLogix (1756 chassis)
• Output Points: 16 (individually isolated)
• Rated Voltage: 24 VDC
• Output Current: 2 A per point (electronic fused)

Electrical Characteristics

• On-State Voltage Drop: Maximum 200 mV
• Diagnostics: Electronic short-circuit protection, open-wire detection, and per-point fault reporting
• Sequence of Events: High-resolution timestamping (1 ms resolution) for change-of-state events
• Isolation: 250 V continuous / 1500 V for 1 minute (point-to-point and field-to-backplane)
• Backplane Current: ~250 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, enabling electronic fuse, diagnostics, and SOE timestamping.
4. Verify operation using module status LEDs and controller diagnostics.

Selection Guidelines

• Select 1756-OB16IEFS when 24 VDC sourcing outputs with electronic fusing, advanced diagnostics, and Sequence of Events recording are required.
• For standard outputs without SOE, consider 1756-OB16E.
• Ensure chassis power supply capacity supports the module’s backplane current draw.

Frequently Asked Questions