Overview
The Allen-Bradley 1756-OF8I is a high-performance analog output module designed for ControlLogix systems. This 8-point module features individual channel isolation, enabling safe independent control of multiple analog outputs. With selectable output ratings and 18-bit resolution, the 1756-OF8I delivers precise analog control across a wide range of industrial automation and motion control applications.
Key Features
- 8 individually isolated analog output channels
- Selectable output ranges: ±10V, 0–10V, 0–5V, and 0–20 mA
- 18-bit resolution for accurate signal control
- Built-in short-circuit protection per channel
- Configurable ramping, clamping, and channel offset via Logix Designer
- Status and fault reporting via module diagnostics
Technical Specifications
- Module Type: Analog Output, Isolated
- Number of Channels: 8
- Output Ratings: ±10V, 0–10V, 0–5V, 0–20 mA (selectable)
- Resolution: 18-bit
- Backplane Current (5.1V): 150 mA
- Backplane Current (24V): 210 mA
- Backplane Power: 5.8 W
- Isolation Voltage: 250V continuous (1350V AC reinforced test)
- Output Impedance: 46 Ω
- Operating Temperature: 0–60°C
- Humidity: 5–95% non-condensing
- Shock Rating: 30G (IEC 60068-2-27)
- Connector: 36-pin, compatible with 1756-TBNH and 1756-TBSH terminal blocks
- Slot Requirement: 1 slot
- Certifications: UL Listed, CSA Certified
Typical Applications
- Proportional valve control in hydraulic systems
- Analog loop outputs for process control
- Precision motor speed regulation
- Load cell and transducer signal conditioning
- Multi-channel voltage/current instrumentation
- PLCs requiring isolated analog outputs with diagnostics
Compatibility & Replacements
The 1756-OF8I is the isolated-channel variant of the standard 1756-OF8 module. It mounts directly into CompactLogix and ControlLogix I/O chassis. Firmware updates are available from Rockwell Automation (current version: v4.012). The module is compatible with Logix Designer and Studio 5000 programming environments. For non-isolated analog outputs, the 1756-OF8 is a suitable alternative. Removable terminal blocks (RTBs) models 1756-TBNH and 1756-TBSH are recommended for simplified wiring and maintenance.
