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The 1771-NOC/B is a high-performance N-Series module. It requires a Remote Terminal Panel (such as 1771-RTP3 or 1771-RTP4) and dedicated interface cables for field wiring. It does not use standard 1771 swing-arm wiring.
8 dedicated current outputs
Universally supports both BCD (Binary-Coded Decimal) and Natural Binary
Specifically engineered for industrial chassis systems, with a backplane current draw of 2.9 A (at 20 mA/output) and up to 3.3 A (at 25 mA/output)
Featuring an advanced 14-bit digital-to-analog (D/A) converter, the 1771-NOC/B delivers exceptional signal granularity and control accuracy, dividing the output range into up to 16,384 discrete steps. This high-resolution capability ensures ultra-smooth transitions and precise positioning, making it ideal for critical process control loops that standard 12-bit modules cannot support.
To guarantee maximum system reliability in harsh electromagnetic environments, the 1771-NOC/B features robust opto-electrical isolation between the field-side wiring and the PLC-5 backplane logic. Furthermore, the module incorporates comprehensive onboard diagnostics and green/red LED status indicators on the front panel to provide immediate visual feedback regarding module health and communication faults.
The module natively supports standard industrial current loops, primarily optimized for 4 to 20 mA configurations, with a maximum scalable range up to 0 to 25 mA. Output ranges and scaling factors are fully user-configurable via software using Block Transfer Write (BTW) instructions, eliminating the need to frequently change hardware jumper blocks for basic operational scaling.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen Bradley 1771-NOC/B CURRENT MODULE Manuals, Datasheets, Drivers, 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.
Oil and Gas Extraction
It controls large pneumatic control valves and Emergency Shutdown Valves (ESD) on long-distance pipelines, precisely adjusting valve openings based on pressure feedback to regulate pipeline pressure.
Petrochemical and Refining
In distillation tower and reactor automation, it outputs 4-20mA signals to precisely control steam heating valves and catalyst dosing pump flow rates.
Thermal Power Plants
It is used in boiler drum water level control systems (three-element control), outputting high-precision signals to control feedwater regulating valves to prevent boiler dry burning.
Steel and Metallurgical Industry
On continuous casting and steel rolling production lines, it controls the speed of multiple large high-voltage VFDs to achieve strict speed synchronization between multi-stage rollers.
Pharmaceutical Industry
In bio-fermentor control, its high-resolution output fine-tunes nutrient feeding valves and pH adjustment liquid dosing valves to meet strict process precision in cleanroom environments.
Paper and Pulp Industry
It controls the pressure valves of the headbox and the steam control valves of the drying cylinders to ensure uniform paper thickness and dryness during high-speed production.
The Allen-Bradley 1771-NOC/B is a high-performance 8-channel isolated current output module for PLC-5 systems. Key usage precautions include that it does not use standard wiring arms and requires a dedicated 1771-RTP3/4 terminal panel with matching cables. Its high backplane current draw up to 3.3A demands sufficient PLC power supply capacity and proper cabinet cooling. In addition, BTW/BTR instructions along with the correct BCD or Natural Binary data format must be properly configured in the software to ensure accurate signal output.
Unlike standard 1771 I/O modules that utilize traditional wiring arms, the 1771-NOC/B interfaces with external field devices through a dedicated Remote Terminal Panel (such as the 1771-RTP3 or 1771-RTP4) and pre-assembled cables (1771-NC6 or 1771-NC15). This specialized connection method optimizes signal integrity, reduces wiring errors, and simplifies hot-swapping procedures during maintenance.
The 1771-NOC/B is an analog output module manufactured by Rockwell Automation under the Allen-Bradley brand for the PLC-5 automation control system. It belongs to the "Series B" hardware generation.
What is the primary purpose of the 1771-NOC/B?
It is used to convert digital signals from the PLC into continuous analog signals to control industrial actuators such as control valves, variable frequency drive (VFD) speeds, servo drives, and heaters.
How many output channels does the 1771-NOC/B have?
This module provides 8 independent analog output channels.
What output signal types does the 1771-NOC/B support?
It supports standard industrial current and voltage signals, typically 4-20 mA, 0-20 mA current signals, and 1-5V, 0-10V, or ±10V voltage signals (selectable via hardware jumpers or configuration).
Where should the 1771-NOC/B be installed?
It must be inserted into a slot of a 1771 I/O chassis, either within the local PLC-5 chassis or in an extended chassis connected via Remote I/O (RIO).
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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