Description
Product Name: 1755-OF8 Allen Braley Controller module
Product details:
The Allen-Bradley product with the catalog number 1755-OF8 does not appear to be a standard, currently available product in the main ControlLogix or CompactLogix lines.
The most similar and highly common analog output module from Allen-Bradley/Rockwell Automation is the 1756-OF8, which belongs to the ControlLogix platform. I will provide a detailed description of the 1756-OF8 module, as the ‘1755-OF8’ may be a slight error in the part number or a less common, older, or application-specific variant.
💡 Allen-Bradley 1756-OF8 Analog Output Module (ControlLogix)
Product Details and Description
The Allen-Bradley 1756-OF8 is a ControlLogix chassis-based Analog Output (A/O) module. It is designed to provide eight (8) high-resolution, individually configurable analog output channels. It is a critical component for industrial automation systems that require precise control over devices like variable speed drives, valves, and actuators.
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Platform: ControlLogix
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Type: Analog Output Module
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Slots: Occupies a single slot in a ControlLogix chassis.
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Terminal Block: Compatible with Removable Terminal Blocks (RTBs) such as the 1756-TBNH or 1756-TBSH (sold separately).
Product Specifications (Key Parameters)
| Parameter | Specification |
| Number of Outputs | 8 isolated, non-isolated, or single-ended outputs |
| Output Signal Range | $\pm 10$ V DC (Voltage) or 0–20 mA (Current) |
| Output Current Limit | Electronically limited to 21 mA or less (for short-circuit protection) |
| Resolution | 15 bits across 21 mA (Current) or 15 bits across 10.4 V (Voltage) |
| Short-Circuit Protection | Provided by electronic current limiting |
| Over-Voltage Protection | Rated at 24V DC |
| Output Settling Time | $< 2$ milliseconds (to 95% of final value with resistive loads) |
| Backplane Power | 5.8 W |
| Operating Temperature | $0$ to $60^\circ \text{C}$ ($32$ to $140^\circ \text{F}$) |
Product Advantages
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High Density: Eight (8) channels in a single module slot save valuable panel space in the ControlLogix chassis.
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Flexibility: Each of the 8 channels can be individually configured for either Voltage ($\pm 10$ V) or Current (0-20 mA) output, providing versatility for various field devices.
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High Accuracy and Resolution: The 15-bit resolution ensures precise control and minimal error in the output signal.
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Robust Diagnostics: It includes built-in protection features like electronic short-circuit and over-voltage protection, which aid in troubleshooting and system reliability.
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ControlLogix Integration: Seamless integration with the ControlLogix architecture allows for local or distributed I/O functionality, fast data exchange, and simplified configuration via Studio 5000 software.
Important Considerations (Notes)
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RTB Required: The module requires a separate Removable Terminal Block (RTB) like the 1756-TBNH or 1756-TBSH for field wiring.
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Calibration: For optimal performance, the module typically has a recommended calibration interval of 12 months.
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Power Consumption: Be mindful of the module’s backplane power draw (5.8 W) when planning the system power supply to ensure sufficient capacity.
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Noise: As with all analog I/O, ensure proper shielding and grounding of field wiring to minimize electrical noise interference and maintain signal integrity.
Product Applications
The 1756-OF8 is widely used in applications requiring the PLC (Programmable Logic Controller) to modulate or precisely set a process parameter.
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Process Control: Controlling the output to PID control loops that drive final control elements such as:
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Control Valves: Adjusting the opening percentage of pneumatic or electric valves.
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Dampers: Setting the position of air dampers in HVAC or combustion systems.
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Motor Control: Providing the speed reference signal (e.g., 0-10V or 4-20mA) to Variable Frequency Drives (VFDs) or servo controllers.
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Metering and Pumping: Setting the flow rate for metering pumps or chemical injection systems.
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Instrumentation: Driving analog indicators, recorders, or other field instruments that accept a standard industrial analog signal.
Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
We have the same series of models in stock. If you don’t find the model you need, please contact us and we will provide you with an official quotation！
Colour：new Warranty: 12 months
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