Overview
The Allen-Bradley 1771-OFE2 is a single-slot analog output module for the 1771 I/O chassis family. This current output module delivers four independently isolated channels capable of generating 4–20 mA signals for controlling final control elements, actuators, and proportional devices. With 12-bit binary resolution and 1000V differential isolation per channel, the 1771-OFE2 provides reliable analog command signals in noisy industrial environments while protecting connected equipment from ground loops and transient faults.
Key Features
- 4 Independently Isolated Output Channels: Each channel rated for 850 VDC isolation (1 second), supporting 1000V differential isolation between channels
- 4–20 mA Standard Output Range: Industry-standard live-zero current range for proportional control and modulating equipment
- 12-Bit Binary Digital Resolution: 4096-step resolution for smooth analog control signals
- Single Slot Design: Compact form factor occupies one slot in any 1771 I/O chassis (keying slots 10–12 and 26–28)
- Natural Binary and BCD Data Scaling: Flexible input formats supporting both binary and BCD coding for ±9999 data values
- Backplane Powered: Draws 1.5A @ 5V DC from chassis; no external power supply required
Technical Specifications
- Output Channels: 4 (individually isolated)
- Output Signal: 4–20 mA DC current
- Digital Resolution: 12-bit binary
- Channel Isolation: 850 VDC @ 1 second; 1000V differential isolation
- DAC Settling Time: Maximum 0.8 ms
- Backplane Current Draw: 1.5 A @ 5V DC
- Power Dissipation: 7.9 W
- Thermal Dissipation: 26.9 BTU/hr
- Operating Temperature Range: 0–60°C (32–140°F)
- Connector: Screw terminal with 12-gauge wire (stranded or solid)
- Field Wiring Arm: Catalog No. 1771-WC
