Allen-Bradley 1746-OB16 | SLC 500 DC Output Module 16 Channel
Introduction:
Allen-Bradley 1746-OB16 SLC 500 DC Output Module. 16 sourcing outputs at 24VDC. High current design with 1.5A per point.
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Product Attributes:
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Product Overview
The Allen-Bradley 1746-OB16 is a discrete DC output module for the SLC 500 system. This module provides sixteen DC output channels in one common group. It delivers nominal output voltage of 24V DC in sourcing configuration. The Allen-Bradley 1746-OB16 operates with an output voltage range of 10 to 30V DC. Users trust this high-current module for demanding DC load control applications.
Technical Specifications
The 1746-OB16 delivers reliable DC output switching with fast response times. Below are the complete technical details.
General Specifications
Manufacturer: Rockwell Automation for industrial control reliability.
Brand: Allen-Bradley for SLC 500 compatibility.
Part Number: 1746-OB16 for precise identification.
Series: SLC 500 programmable controller family.
Module Type: Digital DC Output Module.
UPC: 10662468067055 for universal product identification.
UNSPSC: 32151705 for classification.
Applications: High Current DC load control.
Output Channel Specifications
Number of Outputs: Sixteen (16) outputs.
Output Groups: One (1) group of sixteen channels.
Output Voltage (Nominal): 24V DC.
Output Type: Source configuration.
Operating Voltage Range: 10 to 30 VDC.
Voltage Range (Extended): 10 to 50 Volts DC Source.
Output Delay Time (OFF to ON): 1.0 ms.
Output Delay Time (ON to OFF): 0.1 ms.
OFF State Leakage Current: 1 mA maximum.
Current Ratings by Temperature
Continuous Current per Point @ 30°C: 1.5 A.
Continuous Current per Point @ 55°C: 1.0 A.
Continuous Current per Point @ 60°C: 0.5 A (typical derating).
Continuous Current per Module @ 0-60°C: 6.4 A maximum.
Continuous Current per Module @ 30°C: 9 A maximum.
Backplane Power Specifications
Backplane Current at 5.1 Volts: 0.135 A (135 milliamps).
Backplane Current (5 Volts Alternate): 280 milliamps.
Slot Occupancy: Single slot of SLC 500 chassis.
Thermal Specifications
Heat Dissipation: 7.6 Watts.
Step Response: 60 ms in, 2.5 ms out.
Installation Guide
Follow these steps to install the Allen-Bradley 1746-OB16 correctly.
Power Down the Chassis: Turn off all power to the SLC 500 rack.
Verify Power Supply Capacity: Ensure backplane can supply sufficient current.
Locate an Available Slot: Find any empty I/O slot in the chassis.
Insert the Module: Slide the 1746-OB16 into the slot carefully.
Secure the Module: Lock using the retaining clips at top and bottom.
Wire the Terminal Block: Connect DC loads to the 16 output terminals.
Connect DC Supply: Wire 10-30V DC source power to the common terminal.
Verify Load Current: Do not exceed 1.5A per point at 30°C or 1.0A at 55°C.
Check Total Module Current: Keep under 6.4A continuous across all outputs.
Apply Power: Turn on the backplane power to the chassis.
Check Output Status: Verify module operation with LED indicators.
Test Outputs: Energize outputs and measure ON delay of 1.0 ms and OFF delay of 0.1 ms.
Monitor Leakage Current: Ensure OFF-state leakage stays below 1 mA.
Check Heat Dissipation: Allow adequate ventilation for 7.6 Watts dissipation.
Installation Notes
The module provides 16 sourcing outputs in one common group.
Fast OFF delay of 0.1 ms suits time-critical applications.
OFF-state leakage current is only 1 mA maximum.
Heat dissipation is 7.6 Watts at rated load.
Compatible with SLC 500, CompactLogix, and ControlLogix systems.
Packaging List
This unit ships as a new and original product.
Allen-Bradley 1746-OB16 Discrete DC Output Module
Removable terminal block (pre-installed)
Product data sheet with wiring diagram
Anti-static factory packaging bag
Frequently Asked Questions (FAQ)
1. What is the output voltage range of the 1746-OB16?
The Allen-Bradley 1746-OB16 operates with an output voltage range of 10 to 30 VDC (source). Extended range supports up to 50 VDC.
2. How many outputs does this DC module provide?
The 1746-OB16 provides sixteen sourcing outputs in a single common group. Each output handles up to 1.5A at 30°C.
3. What are the output delay times for the 1746-OB16?
The Allen-Bradley 1746-OB16 has an OFF to ON delay of 1.0 ms and an ON to OFF delay of 0.1 ms. OFF-state leakage current is 1 mA maximum.
4. What is the maximum continuous current per module?
The 1746-OB16 has a maximum continuous current of 6.4 A across all outputs at 0-60°C. At 30°C, the module handles up to 9 A.
5. What is the heat dissipation rating for this module?
The Allen-Bradley 1746-OB16 has a heat dissipation rating of 7.6 Watts. Ensure adequate ventilation in the control cabinet.