Allen-Bradley 1771-NOV N-Series Analog I/O Module

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Technical specifications

Descripution

The Allen Bradley 1771-NOV is a High-resolution Isolated Analog Module. With an output resolution of 1.32 milliVolts/bit, this module gives 1000 Volt isolation between channels. The channel to channel isolation of this module provides the connection of various resources to the same module without creating ground loops or damaging components due to excessive voltage differences between channels. This module has calibration interval of one year. The 1771-NOV has open input and open loop detection features; it easily detects open thermocouples, RTDs, voltage inputs, or current loops. Additionally, the 1771-NOV is equipped with simplified calibration features.

The output range of this module is +10.4 Volts into an open circuit, the output impedance is 1 Ω, and the output overvoltage protection is 140 Volts AC RMS continuous. It has an Offset drift of ±400 µA/degree Celsius, and its Gain drift is limited to ±50 ppm/degree Celsius. The Calibration value of this module is 0.0/10.0 Volts DC; its minimum Ramping value (at 1% FSR) is 0.2 Volts per second, while it's maximum (at 200% FSR)  is 40 Volts per second. The maximum update time is 25 milliseconds. The 1771-NOV also follows Electromagnetic Compatibility (EMC) standards, having passed EN 50081-2 EMC - Generic Emission Standard, Part 2 - Industrial Environment, and EN 50082-2 EMC – Generic Immunity Standard, Part 2 - Industrial Environment.

Connecting or disconnecting the cable while power is being applied to this module (or any device on the network) can result in an electrical arc and damage to machine parts.

FAQ

Q1: How does the AB 1771-NOV module optimize analog signal transduction in mission-critical PLC-5 architectures?
A: The AB 1771-NOV is designed to convert digital control commands into precise analog voltage outputs, enabling accurate regulation of actuators, drives, and process control equipment within PLC-5 systems.

Q2: What distinguishing characteristics make the AB 1771-NOV suitable for high-fidelity voltage output applications?
A: The AB 1771-NOV provides multiple analog voltage output channels with excellent resolution, repeatability, and stability, supporting demanding industrial automation environments.

Q3: Why is the AB 1771-NOV frequently deployed in sophisticated process automation and closed-loop control strategies?
A: The AB 1771-NOV delivers continuous voltage signals required for proportional control, allowing precise modulation of field devices such as variable speed drives, valve positioners, and control interfaces.

Q4: How can the AB 1771-NOV enhance interoperability between PLC-5 controllers and external analog instrumentation?
A: The AB 1771-NOV acts as a reliable interface between the controller and analog field equipment, ensuring seamless signal transmission and consistent process performance across integrated systems.

Q5: What operational considerations should engineers evaluate when commissioning an AB 1771-NOV module in an industrial control network?
A: Engineers should verify output scaling parameters, channel configuration, wiring integrity, and load compatibility to ensure the AB 1771-NOV achieves optimal accuracy and long-term operational reliability.

Wiring Diagrams

Conversion: Conversion: 1771-NOV (1) To 1756-OF8I (1) (Voltage) Using Existing 1771-RTP3 or 1771-RTP4 Interface Module 

Conversion: Conversion: 1771-NOV (1) To 1756-OF6VI (2) (Voltage) Using Existing 1771-RTP3 or RTP4 Interface Module

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