Purchase now: Allen-Bradley 1769-OF4CI Isolated Current Output
Atlantechdrives provides you the 1769-OF4CI, a specialized 4-channel analog output module featuring individual channel-to-channel isolation. This module is the premier choice for current loop control (0-20mA/4-20mA) in industrial environments plagued by ground loops and severe electrical noise.
- Channels: 4 Individually Isolated Current Outputs
- Output Range: 0-20 mA, 4-20 mA
- Isolation: 30V AC / 30V DC (continuous) channel-to-channel
- Resolution: 13-bit
- Backplane Current: 150 mA @ 5.1V / 140 mA @ 24V
- Response Time: 2.9 ms per channel
Technical Performance: Total Isolation for Current Loop Stability
Get now the 1769-OF4CI to eliminate the most common cause of analog inaccuracies: Ground Loops. Unlike standard analog modules that share a common reference ground, the «CI» version provides galvanic isolation between each of the four output channels. This technical superiority ensures that a sensor or drive grounded at a different potential than the PLC will not introduce «noise» or current leakage into other channels. The 1769-OF4CI is engineered for 4-20mA loop control, providing 13-bit resolution for precise control of pneumatic actuators, chemical pumps, and steam valves. When you procure the 1769-OF4CI, you are investing in a module that guarantees signal purity in wastewater treatment, oil and gas, and heavy manufacturing sectors where long cable runs and multiple ground points are unavoidable.
Installation Advice: Protecting Isolated Channels
When installing the 1769-OF4CI, the individual isolation allows you to drive loads from four different power sources without risk of cross-talk. However, you must still follow strict shielding discipline. Ground the shield of each 4-20mA cable at the entry of the PLC cabinet. For best results, use 16 or 18 AWG twisted-pair shielded cable. In the software configuration, ensure you enable the «Open Loop» detection; this diagnostic feature will alert you immediately if a field connection is severed, which is vital for preventing process runaway. Sourcing your 1769-OF4CI from Atlantechdrives ensures you receive a unit with healthy isolation transformers, safeguarding your CPU from field-side voltage spikes.
Maintenance and Long-Term Reliability
The 1769-OF4CI requires stable backplane power to maintain its 13-bit precision. Maintenance should include a yearly check of the 24V DC bus voltage at the terminal. If a single channel shows high error rates, the isolation ensures that the other three will continue to function correctly, providing a higher level of system availability. Sourcing from Atlantechdrives provides the hardware reliability and deterministic performance required for mission-critical current loop control.
FAQs
Q: Does the 1769-OF4CI support voltage outputs?
A: No, the 1769-OF4CI is strictly a current-only module. For voltage isolation, use the 1769-OF4VI.
Q: What is the benefit of the «CI» over the standard «OF4»?
A: The «CI» model provides channel-to-channel isolation, preventing ground loops and increasing signal reliability in noisy plants.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This isolated current output module provides high-precision control for analog loops managed by the 1769-L33ER controller.
