Allen-Bradley 1769-OF2 Analog Output Module Overview

The Allen-Bradley 1769-OF2 is a Compact I/O analog output module. Specifically, it belongs to the CompactLogix series from Rockwell Automation. Therefore, this module provides two single-ended output channels. Consequently, users select the 1769-OF2 for driving modulating devices and actuators. Moreover, the module delivers both voltage and current signals. Finally, it mounts on a DIN rail or directly on a panel.

Technical Specifications of 1769-OF2

The Allen-Bradley 1769-OF2 has two single-ended output channels. Specifically, voltage ranges include ±10V DC, 0-10V, 0-5V, and 1-5V. Current ranges include 0-20 mA and 4-20 mA for flexibility. Full scale analog ranges extend slightly beyond nominal values. Voltage ranges reach ±10.5V DC and -0.5 to 10.5V DC. Current ranges reach 0-21 mA and 3.2-21 mA.

Resolution is 14 bits for unipolar signals. For bipolar signals, resolution is 14 bits plus sign. Conversion rate is 2.5 milliseconds per channel. Step response time is 2.9 milliseconds. Current draw at 5.1V is 120 mA from the backplane. Heat dissipation measures 2.36 Watts. No calibration is required due to hardware design.

The 1769-OF2 uses a sigma-delta Digital-to-Analog converter. Output resolution varies by configured signal type. For ±10V DC, resolution is sign plus 14 bits (0.64 mV). For 0-10V DC, resolution is sign plus 14 bits (0.64 mV). For 0-20 mA, resolution is sign plus 14 bits (1.28 µA). For 4-20 mA, resolution is sign plus 14 bits (1.28 µA).

Load resistance on current output ranges from 0 to 500 Ω. This includes wire resistance for complete circuit. Load resistance on voltage output must exceed 1 kΩ at 10V DC. Inductive load per current output is 0.1 mH maximum. Capacitive load per voltage output is 1 µF maximum. Output impedance is 15 Ω for stable signal delivery.

The 1769-OF2 has a power supply distance rating of 8 modules. Install this module within 8 slots of the power supply. Accuracy at 25°C is ±0.5% for voltage full range. Accuracy at 25°C is ±0.35% for current full range. Module error boundary is 0.8% across operating conditions. Accuracy drift is ±0.0086% per degree Celsius. Repeatability and nonlinearity are ±0.05% each.

Protection and Diagnostic Features

The Allen-Bradley 1769-OF2 includes several protection features. Short-circuit protection limits current to 21 mA maximum. Over-voltage protection guards against wiring faults. Open wire detection time is 10 milliseconds. Offset error margin is ±0.05% for precise output. Slot width is one single slot for compact installations.

Installation Guidelines for Allen-Bradley 1769-OF2

First, mount the 1769-OF2 on a DIN rail or panel. Then, align the module with adjacent CompactLogix units. After that, push the modules together until they seat fully. Next, lock the bus connectors for proper electrical contact. Subsequently, connect field wiring to the output terminals. Finally, apply 24V DC power to the system.

First, shut off all power before wiring the module. Then, use shielded cable for all analog signal wiring. After that, connect the shield drain wire to ground at one end only. For voltage outputs, connect load across output and common. For current outputs, connect load in series with the output. Do not exceed 500 Ω load resistance on current outputs. Finally, close the module door after wiring is complete.

Package Contents of 1769-OF2

Your shipment includes these items:

One Allen-Bradley 1769-OF2 analog output module

One door label for channel identification

One product installation instructions manual

However, the package does not include the 1769-RTBN18 terminal block. Therefore, order this replacement block separately if needed. Also, no mounting hardware is provided with this module. Finally, the replacement door (1769-RD) is sold separately.

Frequently Asked Questions about 1769-OF2

1. What controllers work with the 1769-OF2 module?

The Allen-Bradley 1769-OF2 works with CompactLogix controllers. Specifically, it also works with MicroLogix 1500 as expansion I/O. Therefore, check your controller compatibility before ordering. The module works with PID loops for analog control.

2. Does the 1769-OF2 require field calibration?

No, the 1769-OF2 requires no field calibration. Specifically, the hardware design guarantees accuracy without adjustment. Therefore, simply install and configure the module for use. This saves time during commissioning and maintenance.

3. What is the conversion rate on the 1769-OF2?

The Allen-Bradley 1769-OF2 has a conversion rate of 2.5 ms. Specifically, this is the time to update each output channel. Therefore, the module suits applications needing fast analog response. The step response adds 2.9 ms for signal settling.

4. What load resistance works with the 1769-OF2 current output?

The 1769-OF2 current output works with 0 to 500 Ω load. Specifically, this includes wire resistance in the total calculation. Therefore, use appropriate cable gauge for longer runs. Exceeding 500 Ω will reduce output accuracy.

5. What replacement parts are available for the 1769-OF2?

The Allen-Bradley 1769-OF2 has two available replacement parts. Specifically, the terminal block is 1769-RTBN18. The replacement door is 1769-RD. Therefore, order these separately if damaged in the field. Both parts are in current production.

Compatibility and Application Notes

The Allen-Bradley 1769-OF2 is a current product from Rockwell Automation. Specifically, it belongs to the 1769 Compact I/O family. Use this module for valve positioning and drive speed control. It also works for signal re-transmission to panel meters. UPC number is 10662468992944. UNSPSC code is 32151705. Series A and B are both available. HS code for customs is 85389000. Finally, store the module in a static-free environment before installation. Allen-Bradley and Rockwell Automation manufacture this product in the USA.