Product Description
Allen-Bradley 1756-OF4 Analog Output Module
Product Overview
The Allen-Bradley 1756-OF4 is a 4-channel analog output module designed for ControlLogix systems. It supports both voltage and current output with high resolution, accuracy, and reliability for industrial automation applications.
Technical Specifications
Electrical Ratings
| Attribute | 1756-OF4 Specifications |
|---|---|
| Output Channels | 4 voltage or current outputs |
| Output Voltage Range | ±10V |
| Output Current Range | 0…20 mA |
| Resolution | Voltage: 15-bit across 10.5V (320 µV/bit) Current: 16-bit across 21mA (325 nA/bit) |
| Current Draw @ 5.1V DC | 200 mA max |
| Current Draw @ 24V DC | 155 mA max |
| Backplane Power Consumption | 4.74 W max |
| Power Dissipation | 4.74…1.74 W (depending on load) |
| Thermal Dissipation | 16.17 BTU/hr |
Performance & Accuracy
| Attribute | Specification |
|---|---|
| Open Circuit Detection | Current output only (Output must be set >0.1 mA) |
| Overvoltage Protection | ±24V DC |
| Short Circuit Protection | Electronically current-limited to 21mA max |
| Drive Capability | Voltage: >2000 Ω Current: 0…750 Ω |
| Settling Time | <2 ms to 95% of final value (resistive loads) |
| Calibrated Accuracy | Better than 0.05% of range (0…21 mA, -10.4…10.4V) |
| Offset Drift | 20 µV/°C 80 nA/°C |
| Gain Drift (Max) | Voltage: 6 ppm/°C (125 µV/°C) Current: 30 ppm/°C (630 nA/°C) |
| Module Error | Voltage: 0.1% of range Current: 0.2% of range |
| Module Scan Time | 12 ms (floating point) 8 ms (integer) |
| Data Format | Integer mode (left justified, 2’s complement) IEEE 32-bit floating point |
| Conversion Method | R-Ladder DAC (monotonic, no missing codes) |
Environmental Ratings
| Attribute | Specification |
|---|---|
| Operating Temperature |
Series C: 0…60°C (32…140°F) Series B: 0…55°C (32…131°F) |
| Non-Operating Temperature | -40…85°C (-40…185°F) |
| Relative Humidity | 5…95% (non-condensing) |
| Shock Resistance | 30 g (non-operating) |
| Vibration Resistance | 2 g @ 10–500 Hz |
| ESD Immunity | 6 kV (contact) / 8 kV (air) |
| Surge Protection | ±1 kV (line-to-line), ±2 kV (line-to-earth) |
Mechanical & Installation
| Attribute | Specification |
|---|---|
| Slot Width | 1 |
| Isolation Voltage | 250V (continuous), Basic Insulation (Outputs to Backplane) |
| Terminal Block Options | 1756-TBNH / 1756-TBSH |
| Wire Size (Single Wire) | 0.33–2.1 mm² (22–14 AWG) solid or stranded |
| Wire Size (Double Wire) | 0.33–1.3 mm² (22–16 AWG) solid or stranded |
| Torque (Terminal Block) | 1.36 N•m (12 lb•in) |