Allen-Bradley 1756-OF8IK | ControlLogix Isolated Analog Output Module 8 Channel
Introduction:
Allen-Bradley 1756-OF8IK ControlLogix Isolated Analog Output Module. 8 current outputs with 15-bit resolution. Conformal coated for harsh environments.
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Product Overview
The Allen-Bradley 1756-OF8IK is an isolated analog output module for ControlLogix systems. This module provides 8 current outputs for precise analog control. It features conformal coating for harsh environment protection. The Allen-Bradley 1756-OF8IK supports both 0-20 mA and 4-20 mA output ranges. Users trust this module for critical process control applications requiring isolation.
Technical Specifications
The 1756-OF8IK delivers accurate isolated analog output with robust 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-OF8IK for precise identification.
Series: ControlLogix family.
Module Type: Isolated Analog Output Module.
Outputs: 8 Current outputs.
Enclosure: None (open-style with conformal coating).
Conformal Coating: Applied for harsh environment protection.
Output Specifications
Output Range (Current): 0 to 20 mA or 4 to 20 mA selectable.
Output Range (Voltage): -10 to 10 Volts.
Resolution: 15 bits (16-bit converter).
Output Impedance: 46 Ohms.
Data Format: IEEE-32-bit floating point.
Conversion Method: R-Ladder DAC.
Module Scan Time: 1 millisecond.
Drive Capability (Current Mode): 0 to 1000 Ohms.
Power and Current Draw Specifications
Current Draw (5.1 Volts DC): 200 milliamps.
Current Draw (24 Volts DC): 400 milliamps (base rating).
Current Draw at 24V DC (Current Mode with Loads):
220 mA with 250 Ohm loads.
275 mA with 500 Ohm loads.
340 mA with 750 Ohm loads.
385 mA with 1000 Ohm loads.
Power Dissipation and Backplane Power
Power Dissipation: 6.5 Watts.
Total Backplane Power (Voltage Mode): 6.3 Watts.
Total Backplane Power (Current Mode with Loads):
6.3 Watts with 250 Ohm loads.
7.6 Watts with 500 Ohm loads.
9.2 Watts with 750 Ohm loads.
10.2 Watts with 1000 Ohm loads.
Protection Features
Overvoltage Protection: -30 to +30 Volts.
Short Circuit Detection: For output fault monitoring.
Open-Circuit Detection: For load integrity checking.
Protection Scope: Comprehensive fault coverage.
Terminal Block Compatibility
Screw Terminal Block: 1756-TBNH.
Spring Terminal Block: 1756-TBSH.
Terminal Block Keying: Done mechanically.
Wire Size Recommendation: 22 to 14 AWG solid or stranded.
Wire Type: Shielded copper wire rated for 90°C or greater.
Isolation Specifications
Isolation Voltage: 50 Volts Continuous.
Isolation Type: Between channels and backplane.
Installation Guide
Follow these steps to install the Allen-Bradley 1756-OF8IK 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.
Select Terminal Block: Choose 1756-TBNH (screw) or 1756-TBSH (spring).
Attach Terminal Block: Connect the RTB to the module front.
Insert the Module: Slide the 1756-OF8IK into the slot carefully.
Secure the Module: Lock using the retaining clips at top and bottom.
Wire Field Devices: Use 22-14 AWG shielded copper wire (90°C rating).
Connect Current Loops: Wire loads within 0 to 1000 Ohms.
Select Output Range: Configure each channel for 0-20 mA or 4-20 mA.
Apply 24V DC Power: Ensure external supply meets current requirements.
Apply Backplane Power: Turn on the chassis power supply.
Configure Data Format: Set IEEE-32-bit floating point in software.
Test Outputs: Verify each channel produces correct analog signal.
Check Protection: Test short circuit and open-circuit detection.
Monitor Temperature: Ensure proper cooling for the module.
Installation Notes
The module draws 200 mA at 5.1V DC and up to 400 mA at 24V DC.
Power dissipation is 6.5 Watts with load-dependent backplane power.
Drive capability reaches 1000 Ohms in current mode.
Use shielded copper wire for noise immunity.
Conformal coating protects against harsh environments.
Packaging List
This unit ships as a new and original product.
Allen-Bradley 1756-OF8IK ControlLogix Isolated Analog Output Module
Product data sheet with specifications
Terminal block compatibility guide
Anti-static factory packaging box
Frequently Asked Questions (FAQ)
1. How many analog outputs does the 1756-OF8IK provide?
The Allen-Bradley 1756-OF8IK provides 8 isolated analog outputs. Each output supports 0-20 mA or 4-20 mA current ranges.
2. What is the resolution of the 1756-OF8IK analog output module?
The 1756-OF8IK has 15-bit resolution (16-bit converter). It uses IEEE-32-bit floating point data format with R-Ladder DAC conversion.
3. What is the maximum load resistance for current outputs?
The Allen-Bradley 1756-OF8IK drives loads from 0 to 1000 Ohms in current mode. Current draw varies from 220 mA to 385 mA depending on load.
4. What protective features does this module include?
The 1756-OF8IK includes -30 to +30 Volt overvoltage protection. It also features short circuit detection and open-circuit detection.
5. What terminal blocks work with the 1756-OF8IK?
The Allen-Bradley 1756-OF8IK works with 1756-TBNH (screw type) and 1756-TBSH (spring type) removable terminal blocks. Keying is done mechanically.