Product Overview
The Allen-Bradley 1762-OF4 is a MicroLogix analog output expansion module engineered for precise control in demanding industrial environments. Part of the MicroLogix series from Rockwell Automation, this module provides four single-ended output channels configurable for voltage or current signals. With a compact footprint and robust design, the 1762-OF4 integrates seamlessly into existing control systems, enabling accurate modulation of valves, VFDs, dampers, and other actuators.
Weighing only 235 grams and dissipating just 2.8 Watts, the 1762-OF4 minimizes heat buildup within the control cabinet, contributing to longer system life. Its 12-bit unipolar resolution ensures fine-grained output control, while the R-2R ladder voltage switching DAC delivers stable analog signals. Whether you are upgrading an existing line or building a new automation cell, the 1762-OF4 offers the reliability and performance expected from Allen-Bradley.
Technical Specifications
Below are the key specifications for the Allen-Bradley 1762-OF4, sourced directly from the manufacturer's data:
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number / Catalog No. |
1762-OF4 |
| Product Type |
Analog Output Module |
| Series |
MicroLogix |
| Outputs |
4 Analog |
| No. of Outputs |
Four (4) Single-ended |
| Input Power |
24 Volts DC |
| Analog Normal Operating Range |
0-10 Volts DC; 4-20 mA |
| Output Range |
0-10 Volts DC |
| Full Scale Analog Ranges |
0…10.5V DC; 0…21 mA |
| Converter Type |
R-2R Ladder Voltage Switching |
| Resolution |
12 bits (unipolar) |
| UPC |
10662468153246 |
| Typical Overall Accuracy |
±1.17% full scale at -20 °C…65 °C (-4 °F…149 °F); ±0.5% full scale at 25 °C (77 °F) |
| Repeatability |
±0.12% |
| Dimensions |
90 x 87 x 40 mm (HxDxW) |
| Heat Dissipation |
2.8 Watts |
| Recommended Cable |
Belden 8761 (shielded) |
The 1762-OF4 also features an output protection value of ±32 mA and supports output times of 2.5 milliseconds, ensuring rapid response for dynamic control loops.
Industry Applications
The 1762-OF4 excels in applications requiring precise analog output control. Typical use cases include:
-
Process Control: Driving modulating valves and dampers in HVAC or chemical processing systems to maintain setpoints.
-
Variable Frequency Drives (VFDs): Providing speed reference signals to VFDs for conveyor systems, pumps, and fans.
-
Data Acquisition: Re-transmitting process values to indicators, data loggers, or isolators for monitoring and recording.
With four independent channels, the 1762-OF4 can manage multiple control loops simultaneously, reducing hardware costs and panel space.
Installation & Setup Guidance
Proper installation is critical for reliable operation. The 1762-OF4 must be mounted horizontally on a well-grounded metal panel. If using a DIN rail, ensure the rail is grounded; additional grounding from mounting tabs is not required unless the mounting surface is ungrounded. Follow ESD prevention guidelines during installation—the recommended Belden 8761 shielded cable is sensitive to electrostatic discharge. Use shielded twisted-pair wiring for analog signals to minimize noise interference.
Configure the output channels via the MicroLogix programming software, selecting the appropriate data format (Raw/Proportional or Scaled-for-PID) and output range (0-20mA, 4-20mA, ±10V DC, 0-10V DC, 0-5V DC, or 1-5V DC). Verify that the load impedance meets the module's requirements: resistive load on current output should be between 0 and 500 ohms, while voltage output requires a load greater than 1 kΩ.
Maintenance & Reliability
The 1762-OF4 is designed for long service life with minimal maintenance. Its low heat dissipation (2.8 W) reduces thermal stress on internal components. Periodically inspect the module for dust accumulation and ensure proper airflow around the enclosure. Check wiring connections for tightness and signs of corrosion, especially in humid environments. The module's repeatability of ±0.12% ensures consistent output over time, reducing drift-related downtime.
When replacement is necessary, the 1762-OF4's plug-in design allows quick swaps without disturbing field wiring, minimizing process interruption.
Compatibility & Integration
The 1762-OF4 is designed for use with MicroLogix 1100, 1200, and 1400 programmable logic controllers (PLCs). When used with a MicroLogix 1100, up to four modules can be installed; with MicroLogix 1200, up to six modules are supported; and with MicroLogix 1500, up to seven modules are permitted. The module supports Raw/Proportional and Scaled-for-PID data formats, and can be assigned as the output of a PID controller for closed-loop control. It can also be linked to manual loading stations via HMI or SCADA systems for operator override.
Selection Guide & Purchasing Advice
Before purchasing the 1762-OF4, verify compatibility with your specific MicroLogix controller and confirm the required number of output channels. Check the output ranges you need—this module supports 0-10V DC voltage and 4-20mA current, with full-scale ranges up to 10.5V DC and 21 mA. Ensure your power supply provides 24V DC and that the module's heat dissipation (2.8 W) is within your cabinet's thermal budget.
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