Allen-Bradley 1762-OF4 MicroLogix Analog Output Module

1762-OF4 Allen-Bradley MicroLogix Analog Output Module

Product Introduction

The Allen-Bradley 1762-OF4 is a versatile analog output expansion module for the MicroLogix controller family. It provides four single-ended output channels, each configurable for voltage or current signals. Specifically, it supports 0-10V DC voltage outputs and 4-20 mA current outputs, making it suitable for driving valves, variable frequency drives (VFDs), dampers, and other modulating control elements. Furthermore, the 1762-OF4 can re-transmit signals to indicators, data loggers, isolators, and converters. Its 12-bit resolution and high repeatability ensure precise and reliable analog control in various industrial applications.

Technical Specifications

The 1762-OF4 delivers high-performance analog output with clearly defined electrical characteristics. It operates on 24V DC input power and features an internal R-2R ladder voltage switching digital-to-analog converter (DAC). The module's resolution is 12 bits unipolar, with a repeatability of ±0.12%.

Key Output Characteristics:

• Number of Outputs: 4 (single-ended)

• Voltage Output Range: 0-10V DC (normal operating); 0-10.5V DC (full scale)

• Current Output Range: 4-20 mA (normal operating); 0-21 mA (full scale)

• Output Type: R-2R Ladder Voltage Switching

• Resolution: 12 bits (unipolar)

• Output Time: 2.5 milliseconds

• Heat Dissipation: 2.8 Watts

Accuracy and Performance

The 1762-OF4 provides excellent accuracy across a wide temperature range. Its typical overall accuracy, which includes gain, offset, non-linearity, and repeatability errors, is ±1.17% full scale from -20°C to 65°C. At 25°C, the accuracy improves to ±0.5% full scale. This consistent performance ensures reliable signal generation even in fluctuating environmental conditions.

Additionally, the output protection value is rated at ±32 mA, safeguarding the module against overcurrent conditions. The resistive load for current outputs, including wire resistance, must be between 0 and 500 ohms. For voltage outputs, the load impedance must exceed 1 kΩ.

Compatibility and System Integration

The 1762-OF4 is compatible with MicroLogix 1100, 1200, and 1400 controllers. The number of modules supported varies by controller type:

• MicroLogix 1100: Up to 4 modules

• MicroLogix 1200: Up to 6 modules

• MicroLogix 1500: Up to 7 modules

Furthermore, this module supports Raw/Proportional Format and Scaled-for-PID Format data. It can be assigned as the output of a PID controller for automatic control of devices, or linked to manual entry values from HMIs or SCADA systems. This flexibility makes the 1762-OF4 a valuable component for both simple and complex control strategies.

Mechanical and Environmental Specifications

The Allen-Bradley 1762-OF4 is designed for easy installation and reliable operation. Its dimensions are 90 x 87 x 40 mm (H x D x W) and it weighs only 235 grams. The module must be mounted horizontally on a well-grounded surface, such as a metal panel. Extra grounding connections from the mounting tabs or DIN rail are unnecessary unless the mounting surface itself cannot be grounded.

For wiring, Belden 8761 shielded cable is recommended to minimize noise and ensure signal integrity. Additionally, follow ESD prevention guidelines during installation, as analog signals are sensitive to electrostatic discharge.

Installation Guidelines

Proper installation of the 1762-OF4 is critical for optimal performance and system reliability.

1. Mounting: First, mount the module horizontally on a grounded metal panel or DIN rail. Ensure adequate clearance for heat dissipation.

2. Wiring: Next, use Belden 8761 shielded cable for all analog signal connections. Connect the shields to the ground terminal at the module end only.

3. Configuration: Then, configure each output channel for voltage or current using the appropriate software settings in the MicroLogix programming environment.

4. Load Verification: After that, verify that the connected load meets the specified impedance requirements (0-500Ω for current, >1 kΩ for voltage).

5. Testing: Finally, power up the system and test each output channel with known values to confirm proper operation and signal accuracy.

Packaging List

Each shipment of the Allen-Bradley 1762-OF4 includes the following items:

• 1 x Analog Output Module

• 1 x Installation Instructions manual

Frequently Asked Questions (FAQ)

1. What controllers are compatible with the 1762-OF4?
The Allen-Bradley 1762-OF4 is compatible with MicroLogix 1100, MicroLogix 1200, and MicroLogix 1400 programmable logic controllers.

2. How many output channels does the 1762-OF4 provide?
This module provides four single-ended analog output channels, each independently configurable for voltage or current signals.

3. What voltage and current ranges does the 1762-OF4 support?
The 1762-OF4 supports voltage outputs from 0-10V DC and current outputs from 4-20 mA. Full-scale ranges extend to 0-10.5V and 0-21 mA.

4. What cable type is recommended for wiring the 1762-OF4?
For optimal noise immunity, Belden 8761 shielded cable is recommended for all analog signal connections to the 1762-OF4.

5. What shipping carriers do you use for the 1762-OF4 module?
We ship this product using trusted global carriers such as FedEx, UPS, and DHL to ensure safe and timely delivery.