Product Overview
The Allen-Bradley 1756-OF6VI is a ControlLogix isolated analog output module designed for precise voltage control in industrial automation systems. With six individually isolated channels, this module delivers reliable performance for demanding applications that require signal integrity and channel-to-channel isolation.
Part of the Allen-Bradley ControlLogix platform, the 1756-OF6VI offers a voltage output range of ±10 VDC per channel. Its 14-bit resolution across 21 V (1.3 mV) ensures accurate signal generation, while the 13-bit resolution across 10.5 V plus sign bit provides flexibility for lower-range applications.
This module supports on-board data alarming, scaling to engineering units, real-time channel sampling, and both integer mode and IEEE 32-bit floating-point data formats. These features make it a versatile choice for process control, discrete manufacturing, and critical infrastructure.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1756-OF6VI |
| Series |
ControlLogix |
| Module Type |
Isolated Analog Output Module with voltage loop |
| Number of Outputs |
Six (6) individually isolated channels |
| Output Signal |
Voltage: ±10 VDC |
| Resolution |
14 bits across 21 V (1.3 mV); 13 bits across 10.5 V + sign bit |
| Backplane Current (5 V) |
250 mA |
| Backplane Current (24 V) |
175 mA |
| Accuracy |
0.5% of range |
| Power Dissipation (Max) |
4.9 W at 60 °C |
| Data Format |
Integer mode (left justified, 2's complement); IEEE 32-bit floating point |
| Output Conversion Method |
R-Ladder DAC, monotonicity with no missing codes |
| Removable Terminal Blocks |
1756-TBNH, 1756-TBSH |
| Overvoltage Protection (Max) |
±24 VDC |
| Isolation Voltage |
50 V continuous |
| Short Circuit Protection |
Electronically current limited |
| Open Circuit Detection |
None |
| Enclosure |
None (open-style) |
Industry Applications
The 1756-OF6VI excels in applications where precise voltage outputs are required for controlling variable speed drives, valve positioners, and analog actuators. Its per-channel isolation eliminates ground loop issues, making it ideal for environments with electrical noise.
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Process Control: Regulate proportional valves and dampers in chemical or petrochemical plants.
-
Discrete Manufacturing: Control servo drives and robotic axes in assembly lines.
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Power Generation: Provide setpoints to turbine governors and excitation systems.
By choosing the 1756-OF6VI, you reduce wiring complexity and improve signal integrity, directly contributing to reduced downtime and lower maintenance costs.
Installation & Setup
Install the 1756-OF6VI into any available slot of a ControlLogix chassis. It occupies a single slot and connects to the backplane. Use the recommended removable terminal blocks (1756-TBNH or 1756-TBSH) for wiring.
Before powering up, verify the module's backplane current requirements: 250 mA at 5.1 VDC and 175 mA at 24 VDC. Ensure the chassis power supply can handle the total load. For best accuracy, route output wiring away from high-voltage or high-current cables.
Maintenance & Reliability
The 1756-OF6VI requires minimal routine maintenance. Its electronic short circuit protection and overvoltage protection up to ±24 VDC safeguard the module from common wiring faults.
With an accuracy of 0.5% of range, periodic calibration is recommended to maintain optimal performance. The module's power dissipation is 4.9 W at 60 °C, so ensure adequate airflow within the control cabinet. Operational shock tolerance of 30G and vibration resistance of 2G at 10-500 Hz make it suitable for harsh industrial environments.
Compatibility & Integration
As part of the ControlLogix family, the 1756-OF6VI integrates seamlessly with Allen-Bradley Logix controllers. It supports both local and distributed I/O architectures, allowing flexible system design.
The module's data format options (integer and IEEE 32-bit floating point) ensure compatibility with a wide range of programming environments. Use RSLogix 5000 or Studio 5000 to configure the module for your specific application.
Buying Guide
When purchasing the 1756-OF6VI, verify the part number and ensure it matches your system requirements. Check the module's condition—new, refurbished, or used—and confirm the warranty terms.
PLC Source PRO offers genuine Allen-Bradley 1756-OF6VI modules with reliable sourcing and competitive pricing. Our team can assist with technical specifications and compatibility questions to ensure you get the right part for your application.