Why the 1756-OF6VI Belongs in Your ControlLogix Chassis
When a voltage-loop output card fails, production stops. The Allen-Bradley 1756-OF6VI is the ControlLogix isolated analog output module engineers specify when they need six independent voltage channels they can trust. It occupies a single chassis slot and delivers +/-10 VDC outputs with 14-bit resolution across 21V (1.3 mV), so your control loops stay precise.
This is a practical, service-minded choice for oil, gas, and industrial automation teams that value uptime over paperwork.
What the 1756-OF6VI Actually Delivers
The 1756-OF6VI provides six individually isolated voltage output channels. Isolation matters in mixed-signal cabinets: it keeps channel-to-channel interference out of your loop and protects the backplane. Each channel outputs +/-10 VDC, and the module converts data using an R-Ladder DAC with monotonicity and no missing codes.
Accuracy is 0.5% of range, and calibrated accuracy is better than 0.1% of the output range. Output settling time is under 2 ms to 95% of final value with resistive loads. The module draws 250 mA at 5.1 VDC and 175 mA at 24 VDC, with maximum power dissipation of 4.9 Watts at 60 Celsius.
Data format supports Integer mode (left justified, 2 s complement) and IEEE 32-bit floating point. Scan time is 25 ms floating-point or 10 ms integer.
Technical Specifications
| Specification | Value |
|---|---|
| Outputs | 6 individually isolated voltage channels |
| Output Signal | +/-10 VDC |
| Resolution | 14 bits across 21V (1.3 mV); 13 bits across 10.5V + sign bit |
| Accuracy | 0.5% of range |
| Backplane Current (5.1 VDC) | 250 mA |
| Backplane Current (24 VDC) | 175 mA |
| Power Dissipation (Max) | 4.9 Watts at 60 Celsius |
| Data Format | Integer mode (left justified, 2 s complement) IEEE 32-bit floating point |
| Removable Terminal Blocks | 1756-TBNH, 1756-TBSH |
| Overvoltage Protection | +/- 24 VDC max |
| Isolation Voltage | 50 Volts Continuous |
| Short Circuit Protection | Electronically current limited |
Where the 1756-OF6VI Earns Its Place
In oil and gas, this module drives valve positioners and variable frequency drives that accept voltage commands. Six isolated channels let you control multiple loops from one slot, which saves chassis space and simplifies wiring.
In process industries, the 1756-OF6VI handles analog output for flow, pressure, and temperature control loops. The 14-bit resolution means smooth, precise adjustments rather than stepped output.
For OEM machine builders, the isolated channels reduce noise coupling between drives and sensitive instrumentation. That translates to fewer nuisance faults and less troubleshooting time.
Integration and Compatibility
The 1756-OF6VI is part of the ControlLogix platform. It fits any available slot in a ControlLogix chassis and can serve as local I/O or as part of a distributed architecture. The module accepts removable terminal blocks 1756-TBNH or 1756-TBSH, which simplifies field wiring and module replacement.
If your application requires a specific communication path, confirm your network architecture with Oil AutoTech before ordering. We provide hands-on technical selection help to match the module to your existing setup.
Practical Maintenance Notes
Calibration is recommended every six months. Offset drift is 60 microvolts per degree Celsius typical, and maximum gain drift is 80 ppm per degree Celsius. The module operates from 0 to 60 Celsius at 5-95% non-condensing humidity.
Inspect terminal connections periodically and verify output accuracy against a calibrated reference. Follow the manufacturer’s safety manual for all maintenance activities.
Selection Checklist
Before you buy, confirm your chassis has an open slot and that your field devices accept +/-10 VDC signals. Verify you have compatible terminal blocks (1756-TBNH or 1756-TBSH). Check that your backplane power budget accommodates 250 mA at 5.1 VDC and 175 mA at 24 VDC.
Oil AutoTech supplies ready-to-ship spares for oil, gas, and industrial automation applications. Contact Oil AutoTech today for pricing and availability.
