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        Allen-Bradley 1771-NOC/C
        Allen-Bradley 1771-NOC/C
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        1771-NOC/C

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        The Allen-Bradley 1771-NOC/C features 16-bit input and 14-bit output resolution, meeting the higher precision requirements of demanding process control environments.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 1771-NOC/C

        • Manufacturer:
          Allen-Bradley
        • Part Number:
          1771-NOC/C
        • Product Family:
          PLC-5
        • Product Type:
          N-Series Analog I/O Module
        • Stock:
          1
        • Number of Outputs:
          8 Outputs
        • Output Type:
          Current
        • Output Resolution:
          0-25 Miliamperes (3.20 Microamperes/bit)
        • RTP Choice:
          Unfused, 1771-RTP4; Fused, 1771-RTP3
        • Backplane Current:
          2.9 A (at 20 mA/ouput); 3.3 A (at 25 mA/output)
        • Data Format:
          BDC or Natural Binary
        • Typical AC Signal Delay (Off):
          45 (+/- 15) ms
        • Typical DC Signal Delay (Off):
          50 ms
        • Weight:
          0.79 kg
        • Estimated shipping dimensions:
          5.1x15.2x27.9cm
        • Tariff Code:
          8537101190
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Use Cases Installation Steps Integration & Programming

        Features:

        • Provides High-Resolution Analog Signal Conversion Between Field Devices and the 1771 Rack Backplane
        • Incorporates 16-Bit Input and 14-Bit Output Capability with Programmable Reset Support
        • Works in Conjunction with PLC-5 and Standard 1771 Series Control Systems
        The Allen-Bradley 1771-NOC/C operates as the High-Resolution Isolated Analog I/O Module in a 1771 rack, providing precise current loop outputs and accurate analog signal processing for all control modules within the system. It continuously converts digital setpoints to analog output signals ranging from 0 to 25 mA with 14-bit resolution, while receiving 16-bit input resolution across its isolated channels, delivering 0.01% typical accuracy based on 65,000 count capability over Full-Scale Range (FSR), with offset drift of ±1.0 µA per degree Celsius and gain drift of ±50 ppm per degree Celsius.

        The 1771-NOC/C provides essential analog I/O functions common to the entire control rack, and is a critical component of the control path, directly affecting the proper, normal operation of the overall control system. One or more 1771-NOC/C modules are required per rack depending on the desired analog channel count. The module draws a maximum backplane current of 1.1 A with a power dissipation of 5.5 Watts at 5 Volts, and maintains relative humidity tolerance between 5% and 95% without condensation. When handling the 1771-NOC/C during installation or maintenance, operators must strictly follow the guidebook procedures, as this module is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation.

        For Safe-State Output applications, the 1771-NOC/C supports programmable reset values configured independently for each output channel. In addition to standard hold-last-state operation, the reset configuration also performs automatic output restoration. The 1771-NOC/C executes channel resets using the internal circuitry specified in the analog output options. Using this method, the module continually monitors the output state of each channel. If the system detects that the primary control signal is no longer providing stable output (outside configured current/tolerance levels), it will automatically transfer the channel to the programmed reset value and place the output in the configured safety state.

        The 1771-NOC/C Allen-Bradley N-Series Analog I/O Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Allen-Bradley 1771-NOC/C 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.
        Allen-Bradley 1771-NOC/C N-Series Analog I/O Module Specs

        General

        • Manufacturer Allen-Bradley
        • Model 1771-NOC/C
        • Condition New Original ready stock
        • Product Family 1771-NOC,1771-NOV,1771-NIV
        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.
        • Proportional Valve Control: Regulates the opening percentages of pneumatic and hydraulic flow valves.
        • Motor Speed Regulation: Sends target velocity references to Variable Frequency Drives (VFDs).
        • Process Signal Emulation: Simulates analog loop instrumentation during system testing.
        • Isolated Loop Controls: Prevents electrical cross-talk in chemical, water, and manufacturing plants.
        • Power Down: Turn off all electrical power to the 1771 I/O chassis before insertion.
        • Set Jumpers: Configure the onboard hardware jumpers for target "Last State" fault behaviors.
        • Insert Module: Slide the module into any available chassis slot except the leftmost processor slot.
        • Attach Wiring Arm: Secure the dedicated 1771 Field Wiring Arm onto the module pivot pins.
        • Secure Latches: Close the top and bottom chassis latching arms to lock the unit in place.
        • Field Wiring: Connect field devices directly to the removable terminal blocks on the wiring arm.
        • Data Blocks: Program Block Transfer Write (BTW) instructions to send configuration and output data.
        • Status Monitoring: Program Block Transfer Read (BTR) instructions to capture real-time diagnostic flags.
        • Thermal Management: Limit the power dissipation of adjacent slots to 10 Watts maximum.
        Description
        The Allen-Bradley 1771-NOC/C is a isolated analog I/O module belonging to the N-Series, engineered specifically for industrial environments that demand exceptional precision in process control. As a critical component within the High-resolution Isolated Analog Modules series, the 1771-NOC/C delivers 16-bit input resolution and 14-bit output resolution, enabling users to manage processes with significantly tighter tolerance and enhanced accuracy. This 1771-NOC/C module achieves a typical accuracy of 0.01% based on a 65,000 count capability over Full-Scale Range (FSR), making it an ideal solution for applications where even minor deviations in analog signal output can impact overall system performance. Designed to address the challenges of precise current loop control and reliable analog signal generation, the 1771-NOC/C solves critical problems in process automation by providing stable, accurate output signals that maintain consistency across varying operational conditions.

        The 1771-NOC/C is specifically designed for applications requiring isolated high-resolution analog output control, such as closed-loop process control systems, precision manufacturing automation, and instrumentation loops in industrial facilities. Its output range of 0 to 25 mA, combined with an output impedance greater than 1 MΩ and continuous output overvoltage protection of 140 Volts AC RMS, ensures safe and reliable operation when driving field devices including control valves, variable frequency drives, and process transmitters. The module features programmable reset values for each of its output channels, configured independently to match specific application requirements, thereby enhancing system safety by ensuring outputs transition to predetermined safe states during fault conditions or system restarts. With a maximum update time of 25 milliseconds and programmable ramping capabilities ranging from a minimum of 0.16 mA per second to a maximum of 32 mA per second, the 1771-NOC/C provides smooth, controlled signal transitions that prevent process disturbances during setpoint changes.

        For organizations currently utilizing legacy analog output modules, upgrading to the 1771-NOC/C represents a substantial improvement in resolution, accuracy, and channel configurability. The enhanced 16-bit input and 14-bit output resolution of the 1771-NOC/C provides significantly finer control granularity compared to standard analog modules, enabling tighter process tolerances and improved product quality in precision manufacturing and process industries. 
        Revisions

        Revision Part #

        Also known as

        1771-NOC Ser A
        1771-NOC/A, Series A, Rev A
        Get Parts Quote
        1771-NOC Ser B
        1771-NOC/B, Series B, Rev B
        Get Parts Quote
        Alternative Names
        1771-NOC 1771-N0C/C 1771N0C/C 1771NOC/C 177I-NOC/C 177INOC/C I771-NOC/C 1771-NIS 1771-NOV 1771-NIV
        Technical notes
        When integrating the 1771-NOC/C into existing 1771-series systems, engineers should verify backplane power capacity, ensure proper grounding to mitigate electrostatic discharge risks, and leverage the independent channel configuration capabilities to optimize reset behaviors for each specific control loop.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        What level of accuracy does the Allen-Bradley 1771-NOC/C provide?
        The Allen-Bradley 1771-NOC/C delivers exceptional analog output precision with a typical accuracy of 0.01% of the Full-Scale Range (FSR), utilizing a 65,000-count resolution. This high level of accuracy makes it suitable for industrial applications that require stable and repeatable process control.
        How does the 1771-NOC/C maintain long-term output stability?
        The 1771-NOC/C is designed with low drift characteristics, including an offset drift of ±1.0 µA/°C and a gain drift of ±50 ppm/°C. These specifications help maintain output accuracy even when ambient temperatures fluctuate, ensuring dependable performance in demanding industrial environments.
        What industrial challenges does the Allen-Bradley 1771-NOC/C solve?
        The 1771-NOC/C addresses common issues such as signal degradation, electrical noise, and ground-loop interference. Its isolated high-resolution output channels help maintain accurate current-loop signals over long distances, ensuring reliable data transmission and precise control in complex industrial systems.

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