Overview
The Allen-Bradley 1756-OF6CI is a ControlLogix Series A isolated analog output module engineered for precision current loop control in industrial automation systems. This module features 6 individually-isolated current outputs with 13-bit resolution across 21 milliamps (2.7 µA per bit), supporting flexible 0-20 mA and 4-20 mA ranges. The 1756-OF6CI requires either the 1756-TBNH or 1756-TBSH removable terminal block housing (RTB) for installation in a ControlLogix chassis, making it suitable for drop-in integration into existing control architectures.
Key Features
- 6 individually-isolated current outputs with separate grounds eliminate cross-channel interference and ground loops
- 13-bit resolution across 21 milliamps (2.7 µA) for granular control of proportional devices
- Flexible 0-20 mA and 4-20 mA output ranges with -32768 to 32767 counts mapping
- Calibrated accuracy better than 0.1% of 4-20 milliamps at 25°C ensures tight process control
- Data echo, ramping/rate limiting, clamping/limiting, and hold-for-initialization features
- 24V DC overvoltage protection and electronic short-circuit protection safeguard against electrical faults
Technical Specifications
- Output Range: 0-20 mA and 4-20 mA (user-selectable)
- Resolution: 13-bit across 21 mA
- Calibrated Accuracy: Better than 0.1% at 25°C
- Output Settling Time: <2 ms to 95% of final value (resistive loads)
- Module Scan Time: 10 ms (integer format), 25 ms (floating-point format)
- Gain Drift: 60 ppm/°C nominal, 100 ppm/°C maximum
- Backplane Power Demand: Up to 8.5 W
- Communication Formats: Integer and floating-point supported
- Calibration Interval: 6 months
- Weight: Approximately 0.3 kg
- Terminal Block Housing Required: 1756-TBNH or 1756-TBSH (sold separately)
Typical Applications
The 1756-OF6CI accommodates a wide range of industrial devices and control scenarios:
- Process Control and Instrumentation – Temperature, pressure, and flow control requiring precise 4-20 mA signals
- Proportional Valve and Pump Actuation – Hydraulic and pneumatic systems requiring modulated current outputs
- Motor Speed and Torque Control – Variable-frequency drive coordination via isolated current loops
- Analog Feedback Signals – Real-time process feedback generation for SCADA and distributed control systems
- Sensor Signal Conditioning – Transducer output conditioning for level, load, and position control
Compatibility & Replacements
Compatible With
- Allen-Bradley ControlLogix 1756 chassis and backplane systems
- ControlLogix, CompactLogix, GuardLogix, and DriveLogix controllers
- Rockwell Automation Studio 5000 Logix Designer software
- EtherNet/IP and PROFINET industrial networks
- 1756-TBNH and 1756-TBSH terminal block housings (required for installation)
- Allen-Bradley PowerFlex drives and distributed I/O modules
Replaces / Drop-In Replacement For
The 1756-OF6CI is a standard ControlLogix current output module. Verify compatibility with your system integrator before ordering. Rockwell Automation technical support can confirm any legacy or alternate model numbers.
Works With
- Rockwell Studio 5000 Logix Designer and CompactLogix programming software
- EtherNet/IP networks and standard industrial Ethernet protocols
- Standard 4-20 mA current loop sensors and actuators
- Allen-Bradley controllers and distributed I/O architecture
- Third-party SCADA and HMI systems supporting analog current output integration
