Overview
Manuals
Application Details
Features:
- PLC 5 N-Series Analog I/O Module
- 0 Inputs, 8 Outputs, 2.9 A (at 20 mA/ouput); 3.3 A (at 25 mA/output) Backplane Current
- 1771-NOC is one edition in the High-resolution Isolated Analog Modules series.
The Allen Bradley 1771-NOC belongs to a series of high-resolution isolated analog modules. This module offers high resolution and accuracy, enabling users to control process flows with greater tolerance. The Allen Bradley 1771-NOC features 16-bit input resolution and 14-bit output resolution. Based on a full-scale (FSR) counting capability of 65,000 counts, the module typically achieves 0.01% accuracy. It features programmable output reset values, allowing users to select the optimal reset value according to application requirements (each channel can be configured independently).
The 1771-NOC consumes 5.5 watts at 5 volts. The module operates over a temperature range of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit) and has a data storage temperature range of -40 to 85 degrees Celsius (-40 to 185 degrees Fahrenheit). This module typically operates in environments with relative humidity ranging from 5% to 95%, without condensation, and has a maximum backplane current of 1.1 A. Its output range fluctuates between 0 and 25 mA, with an output impedance greater than 1 MΩ and output overvoltage protection of 140 V AC RMS continuous value.
The 1771-NOC Allen Bradley N-Series Analog I/O Module may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen Bradley 1771-NOC N-Series Analog I/O Module Manuals(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
1.Proportional control valves: Regulate pneumatic or hydraulic positioners (e.g., Fisher DVC controllers) via 4-20mA signals to control the flow of steam, oil, water, or gas.
2.Damper and louver positioning: Control large intake dampers in combustion control systems or commercial HVAC chillers.
3.PID loop execution: Output as the final control element in a complex proportional-integral-derivative (PID) software loop managed by a PLC-5 processor.
4.Speed reference overcurrent loop: Send precise 4-20mA current commands to large AC/DC drives (e.g., A-B PowerFlex or classic 1336 drives) to regulate motor speed.
5.Synchronized roller and tension control: In paper mills, printing plants, and steel rolling mills, multiple 1771-NOC channels operate simultaneously, with real-time roller adjustment to prevent raw material tearing or loosening.
6.Ground loop suppression: Suitable for large plants (e.g., water treatment plants or oil fields) where field actuators are miles apart and have different ground potentials. Isolation prevents electrical noise loops and interference with adjacent signals.
7.Substation and power plant automation: Installed near high-voltage motor control centers (MCCs) or switchgear, where strong electromagnetic interference (EMI) can easily distort non-isolated analog cards.
8.Fail-safe valve positioning: Configured to reduce the output current to 0mA (or maintain the last value) when the PLC rack loses communication with the central controller. This immediately triggers a spring-reset valve to close rapidly (or open fully), preventing chemical spills or tank overflows.
