Allen-Bradley 1769-OF4CI Analog Current Output 4 Ch

1769-OF4CI AB Compact I/O 4-Point Isolated Current Output

Product Introduction

The Allen‑Bradley 1769‑OF4CI is a compact analog output module that offers four differential, individually isolated channels. Specifically, this module generates current outputs only, supporting both 0-20 mA and 4-20 mA signal ranges. For instance, you can configure each channel independently for either range based on your application needs. Meanwhile, the full-scale analog ranges extend to 0-21 mA and 3.2-21 mA respectively, providing a useful safety margin. Therefore, this flexibility makes the 1769‑OF4CI ideal for driving modulating actuators and final control elements in process control systems.

High-Performance Technical Specifications

The module integrates a high-resolution Digital-to-Analog converter for precise signal generation. Consequently, it achieves an impressive 16-bit resolution (unipolar) , with 0.323 µA per bit for both 4-20 mA and 0-20 mA ranges. Specifically, the conversion rate is 110 ms, which ensures stable and reliable output for most process control applications. Moreover, the step response completes within 2.9 ms for the voltage-to-current ratio, providing responsive control performance.

Accuracy remains a critical factor for this device. At 25 °C, the current accuracy is ±0.35% of full range. Additionally, the module error boundary is a low ±0.55%, with an accuracy drift of only ±0.0058% per degree Celsius. Therefore, this module maintains stable performance even in fluctuating temperatures. Furthermore, its nonlinearity margin is ±0.05%, while repeatability reaches an exceptional ±0.005%, guaranteeing consistent operation over time.

Output Capabilities and Load Characteristics

Each channel on the 1769‑OF4CI can drive a variety of current-loop loads without difficulty. The resistive load range is 0 to 500 Ω, including wire resistance. Furthermore, the module handles an inductive load of up to 0.1 mH per current output. These specifications allow the 1769‑OF4CI to interface reliably with most common actuators, valves, and signal receivers. Besides that, the output impedance is rated at less than 1 MΩ, which ensures proper signal transfer across the current loop.

Data Formats and Configuration Options

The 1769‑OF4CI supports multiple data formats to suit different control strategies. For example, you can select Raw/Proportional data for direct digital control. Similarly, Engineering Units provide real-world scaling for easier interpretation. Additionally, Scaled for PID format integrates seamlessly with proportional-integral-derivative control loops. Finally, Percent Full Range offers a simple percentage-based representation. Consequently, this versatility makes the module suitable for a wide variety of programming environments and control philosophies. Each channel's parameters are individually configurable, including output range selection, module inhibition, and slot assignment.

Protection and Diagnostic Features

Reliability is enhanced through comprehensive built-in protection circuits. The 1769‑OF4CI includes short-circuit protection with a maximum current limit of 21 mA. It also features over-voltage protection to safeguard the module and connected devices. Moreover, it offers both open and short-circuit detection capabilities. The module performs auto-calibration and self-test every time you power cycle it, ensuring consistent accuracy. During self-test, the module becomes temporarily unresponsive but automatically resumes active operation afterward. New output values are actively compared to high and low clamp settings, preventing outputs from exceeding defined limits.

Mechanical and Environmental Parameters

The 1769‑OF4CI comes in a single-slot width form factor. Its physical dimensions are 118 x 35 x 87 millimeters (4.65 x 1.38 x 3.43 inches), and it weighs approximately 270 grams (0.60 pounds). You can mount it on a standard DIN rail or directly onto a panel. For wiring, the module uses solid copper wire sizes from 22 to 14 AWG, or stranded wire from 22 to 16 AWG. The recommended cable is Belden 8761 (shielded) for optimal noise immunity. Its heat dissipation is rated at 2.0 W, and it draws 165 mA at 5.1V from the backplane. Notably, the power supply distance rating is 8, which simplifies system layout and planning.

Installation and Compatibility

Installation of the 1769‑OF4CI is straightforward and user-friendly. First, secure the module to the DIN rail or panel using standard mounting hardware. Next, connect the wiring using the recommended 22-14 AWG solid or 22-16 AWG stranded copper wire. Use shielded cable like Belden 8761 for best performance in noisy environments. For replacement parts, the door is the 1769-RD. This module is compatible with MicroLogix 1500 and CompactLogix controllers. It can also install in a remote I/O chassis using the 1769-ADN DeviceNet adapter or the 1769-AENTR Ethernet adapter. Power supply options include 1769-PA2, 1769-PB2, 1769-PA4, and 1769-PB4. Best of all, no field calibration is ever required, as the hardware design guarantees long-term accuracy.

ESD Precautions

The 1769‑OF4CI contains sensitive components that electrostatic discharge can damage. Therefore, always touch a grounded object before handling the module to discharge static potential. Avoid touching the bus connector or the connector pins directly. Whenever possible, use a static-safe workstation for installation and maintenance. When not in use, keep the module in its static shield box for safe storage.

Application Scenarios

The 1769‑OF4CI serves as a critical component in process control systems. For example, you can use it to drive modulating final control elements like valves and dampers. Similarly, it works effectively with indicating devices such as recorders and data loggers. Additionally, the output signals can retransmit data to remote monitoring systems. The analog signal may also serve as the control output for a PID controller. Furthermore, operators can initiate outputs via HMI, SCADA, or DCS systems. Consequently, this module offers exceptional versatility across numerous industrial applications.

Packaging List

• 1769-OF4CI Analog Current Output Module (1 unit)

• Removable Terminal Block (RTB) – 1 piece

• Module Door – 1 piece

• Installation Instructions (printed guide)

Note: This package does not include certificates, software, or warranty documents. Shipping is handled via FedEx, UPS, or DHL.

Frequently Asked Questions (FAQ)

1. What controllers are compatible with the 1769-OF4CI?
This module works with MicroLogix 1500 and all CompactLogix controllers. It also supports remote I/O installations using 1769-ADN or 1769-AENTR adapters.

2. Do I need to calibrate the 1769-OF4CI after installation?
No. The 1769‑OF4CI does not require any field calibration. The module performs auto-calibration automatically during each power cycle.

3. What output ranges can the 1769-OF4CI support?
It supports 0-20 mA and 4-20 mA current signals. The full-scale ranges extend to 0-21 mA and 3.2-21 mA respectively for added safety margin.

4. What cable is recommended for the 1769-OF4CI?
The recommended cable is Belden 8761, which is a shielded cable that provides excellent noise immunity for analog current signals.

5. What shipping carriers do you use?
We ship all orders via FedEx, UPS, or DHL to ensure fast and reliable delivery worldwide.