Allen-Bradley 1771-NOV | PLC-5 8-Channel Analog Voltage Output Module

Product Description

The 1771-NOV  is a high-performance analog output solution engineered for the Allen-Bradley PLC-5 platform. As part of the specialized N-Series lineup, this module provides eight independent voltage outputs, making it an essential component for controlling variable speed drives, proportional valves, and other actuators requiring precise DC voltage signals. The 1771-NOV is designed for high-density applications within a 1771 universal I/O chassis, offering granular resolution and robust signal isolation to maintain system integrity in electrically noisy industrial environments.

Technical Hardware and Signal Specifications

• Module Classification: N-Series Analog Output

• Catalog Identifier: 1771-NOV

• Output Configuration: 8 Isolated Voltage Channels

• Signal Range: -10V to +10V DC (Bipolar)

• Output Resolution: 1.32 mV per bit

• Data Formatting: Natural Binary or BCD (Binary Coded Decimal)

• Backplane Current Load: 2.1 Amperes at 5V DC

• Power Dissipation: Approximately 10.5 Watts

• Isolation Voltage: 1500V RMS (continuous) between outputs and backplane

• Remote Termination Panel (RTP): Compatible with 1771-RTP4 (Unfused) or 1771-RTP3 (Fused)

• Field Wiring Interface: Requires 1771-WH Wiring Arm

• Mounting Protocol: 1771 Universal I/O Chassis (Slot-based)

• Conversion Rate: Simultaneous update for all channels

• Module Weight: 0.79 kg (1.75 lbs)

Implementation and Diagnostic FAQ

What are the specific advantages of the N-Series 1771-NOV over standard analog modules?

The N-Series 1771-NOVis designed with enhanced circuitry for faster signal processing and improved noise immunity. While standard modules are sufficient for general tasks, the N-Series is often specified for high-precision motion control or sensitive chemical dosing processes where signal stability is paramount.

Why is the backplane current consumption so high (2.1A)?

The 1771-NOV provides eight high-resolution analog outputs which require significant internal regulation and isolation for each channel. When designing your PLC-5 system, it is critical to ensure the chassis power supply (such as a 1771-P7) has enough overhead to accommodate this specific current draw alongside other digital and analog modules.

How is signal integrity maintained over long distances?

To achieve the best results with the 1771-NOV, shielded twisted-pair cabling is recommended. The use of the 1771-RTP3 fused termination panel is also advised for field-side protection, ensuring that external surges do not propagate back to the sensitive N-Series logic components.