1756-OB16DK A-B | ControlLogix Diagnostic Output Module Conformal
Introduction:
Allen-Bradley 1756-OB16DK Diagnostic DC Output Module. 16 diagnostic outputs at 24V DC source. 2A per point with conformal coating.
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Product Overview
The Allen-Bradley 1756-OB16DK is a diagnostic DC output module for ControlLogix systems. This module provides 16 diagnostic outputs with 8 points per group. It operates at 24 Volts DC source voltage. The Allen-Bradley 1756-OB16DK features conformal coating for protection against corrosive elements. Users trust this module for critical output applications requiring diagnostics.
Technical Specifications
The 1756-OB16DK delivers robust diagnostic output performance with environmental protection. Below are the complete technical details.
General Specifications
Manufacturer: Rockwell Automation for industrial control reliability.
Brand: Allen-Bradley for ControlLogix compatibility.
Part Number: 1756-OB16DK for precise identification.
Series: ControlLogix family.
Module Type: Diagnostic DC Output Module.
Outputs: 16-Point Diagnostic (8 points per group).
Enclosure: None (open-style).
Conformal Coating: Applied for protection against corrosive elements.
T4A Rating: Complies with North American temperature code.
Voltage Specifications
Voltage Type: 24 Volts DC Source.
Operating Voltage Range: 19.2 to 30 Volts DC.
Isolation Voltage: 50 Volts Continuous.
Current Ratings
Maximum Output Current per Point: 2 Amps.
Maximum Output Current per Module (30°C): 8 Amps.
Maximum Output Current per Module (60°C): 4 Amps.
Pilot Duty Current (30°C): 2 Amps.
Pilot Duty Current (60°C): 1 Amp.
Output Delay Times
Off to On (Nominal): 60 microseconds.
Off to On (Maximum): 1 millisecond.
On to Off (Nominal): 630 microseconds.
On to Off (Maximum): 5 milliseconds.
Response Speed: Fast switching for diagnostic applications.
Power and Backplane Specifications
Backplane Current (5.1 Volts DC): 250 milliamps.
Backplane Current (24 Volts DC): 140 milliamps.
Total Backplane Power Draw: 4.4 Watts.
Maximum Power Dissipation (60°C): 3.3 Watts.
Thermal Dissipation: 11.25 BTU per hour.
Physical and Installation Specifications
Slot Requirement: One slot in ControlLogix chassis.
Removable Terminal Blocks: 1756-TBCH, 1756-TBS6H compatible.
Mounting: Standard ControlLogix backplane.
Environmental Specifications
Maximum Surrounding Air Temperature: 60°C (not to exceed).
Storage Temperature: -40 to 85°C.
Vibration Rating: 2 G at 10 to 500 Hertz.
Operating Shock Rating: 30 G.
Hazardous Location Protection: Conformal coating for corrosive elements.
Installation Guide
Follow these steps to install the Allen-Bradley 1756-OB16DK correctly.
Power Down the Chassis: Turn off all power to the ControlLogix rack.
Locate an Available Slot: Find any empty I/O slot in the chassis.
Insert the Module: Slide the 1756-OB16DK into the slot carefully.
Secure the Module: Lock using the retaining clips at top and bottom.
Select Terminal Block: Choose 1756-TBCH or 1756-TBS6H for wiring.
Wire Outputs: Connect loads to the 16 diagnostic output points.
Apply DC Power: Connect 19.2 to 30V DC source to the module.
Verify Group Wiring: Each group has 8 points for organized wiring.
Insert Terminal Block: Plug the wired RTB into the module front.
Apply Backplane Power: Turn on the chassis power supply.
Check Current per Point: Ensure each output stays under 2 Amps.
Monitor Temperature: Keep ambient below 60°C for full 4A module rating.
Test Diagnostic Features: Verify output diagnostics report faults.
Measure Delay Times: Confirm off-to-on delay under 1ms maximum.
Installation Notes
The module draws 250 mA at 5.1V DC and 140 mA at 24V DC.
Power dissipation is 3.3 Watts maximum at 60°C.
Thermal dissipation is 11.25 BTU per hour.
The conformal coating protects against corrosive elements in hazardous locations.
Outputs are organized as 8 points per group for diagnostic monitoring.
Packaging List
This unit ships as a new and original product.
Allen-Bradley 1756-OB16DK Diagnostic DC Output Module
Conformal coating (pre-applied)
Product data sheet with diagnostic features
Anti-static factory packaging box
Frequently Asked Questions (FAQ)
1. How many diagnostic outputs does the 1756-OB16DK provide?
The Allen-Bradley 1756-OB16DK provides 16 diagnostic outputs organized as 8 points per group. Each output supports 2 Amps maximum.
2. What is the operating voltage range for this diagnostic output module?
The 1756-OB16DK operates from 19.2 to 30 Volts DC at 24V DC source. The isolation voltage is 50 Volts continuous.
3. What is the maximum current rating at different temperatures?
The Allen-Bradley 1756-OB16DK supports 8 Amps per module at 30°C and 4 Amps per module at 60°C. Per-point current is 2 Amps maximum.
4. What terminal blocks are compatible with the 1756-OB16DK?
The 1756-OB16DK works with 1756-TBCH and 1756-TBS6H removable terminal blocks. These provide flexible wiring options.
5. Does this module have conformal coating for harsh environments?
Yes, the Allen-Bradley 1756-OB16DK is conformally coated for protection against corrosive elements in hazardous locations. It complies with T4A temperature code.