Allen-Bradley 1771-NBSC/C
Allen-Bradley 1771-NBSC/C
Allen-Bradley 1771-NBSC/C
Allen-Bradley 1771-NBSC/C
Allen-Bradley 1771-NBSC/C
Allen-Bradley 1771-NBSC/C
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1771-NBSC/C

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The Allen-Bradley 1771-NBSC/C source input module belongs to the Allen-Bradley 1771-N series and is fully compatible with Allen-Bradley PLC-3, PLC-5, and PLC-5/250 programmable controllers.
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Technical specifications for 1771-NBSC/C

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1771-NBSC/C
  • Product Family:
    PLC-5
  • Product Type:
    Sourcing Input Module
  • Stock:
    1
  • Number of Inputs:
    6 Inputs
  • Input Types:
    Current
  • Number of Outputs:
    2 Outputs
  • Output Type:
    Current
  • Output Resolution:
    0-25 Miliamperes (3.20 Microamperes/bit)
  • Input Resolution:
    4-20 Miliamperes (0.34 Microamperes/bit) (Module Suppllies Loop Power)
  • Typical AC Signal Delay (Off):
    45 (+/- 15) ms
  • Typical DC Signal Delay (Off):
    50 ms
  • Weight:
    0.68 kg
  • Estimated shipping dimensions:
    5.1x15.2x25.4cm
  • 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 Environmental Ratings Communication & Connectivity

Features:

  • Analog Signal Interface for 4-20mA Current Loop Devices on the 1771 I/O Chassis Backplane
  • Sixteen-Bit Input Resolution with Thirteen-Bit Output Capability for Precision Process Control
  • Compatibility with PLC-3, PLC-5, and PLC-5/250 Programmable Controller Systems
The Allen-Bradley 1771-NBSC/C Sourcing Input Module serves as an analog I/O interface within the 1771 modular control system, providing six 4-20mA current input channels and two 0-25mA current output channels for continuous process variable monitoring and control. It continuously conditions incoming analog current signals from field transmitters and delivers regulated output signals to final control elements, distributing these signals through the 1771 I/O chassis backplane to support steady-state operation of the programmable controller. The 1771-NBSC/C draws a maximum of 2.6A from the chassis backplane and dissipates 13W during operation. The module requires the RTP-4 device for proper termination and signal integrity.

The 1771-NBSC/C provides essential analog input and output functions within the control rack, and is a critical component of the process control path, directly affecting the accurate acquisition and delivery of continuous process data. One 1771-NBSC/C module occupies a single slot in the 1771 I/O chassis and must be properly seated for reliable backplane communication. Power must be disconnected before removing or installing the 1771-NBSC/C module to prevent electrical damage and ensure personnel safety.

For the six current input channels, the 1771-NBSC/C accepts a range of 0.1 – 21 mA with a resolution of 330nA per bit at 16 bits unipolar, and the input impedance reaches a maximum of 300ohm. The module supplies 20 – 30V DC loop power for 0-20mA current loops and provides input overvoltage protection rated at 24V DC continuous. The 1771-NBSC/C requires 5 seconds to detect open input conditions and offers a minimum normal mode rejection of 50/60 dB with a typical common mode rejection of 150 dB. The offset drift is ±200nA/°C and the gain drift is ±95 ppm/°C. The input bandwidth is 9Hz and the calibration values are 1.000mA/21.000mA, with under-range and over-range thresholds at 3.2mA and 21mA respectively.

The 1771-NBSC/C Allen-Bradley Sourcing Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1771-NBSC/C Sourcing Input 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-NBSC/C Sourcing Input Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1771-NBSC/C
  • Condition New Original ready stock
  • Product Family 1771-NIS,1771-NB4S,1771-NBSC
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.
  • Process Instrumentation: Monitors flow meters, pressure transmitters, and temperature sensors.
  • Loop-Powered Integration: Powers and reads 2-wire loops using internal 20–30V DC power.
  • Precision Actuator Control: Regulates control valves and variable speed drives via 13-bit outputs.
  • Legacy Plant Support: Maintains PLC-5, PLC-3, or PLC-5/250 control architectures.
  • Environment Class: Rated for Pollution Degree 2 and Overvoltage Category II.
  • Enclosure Type: Open-type equipment requiring a tool-accessible, protective enclosure.
  • Altitude: Operates up to 2000 meters without performance derating.
  • Signal Protection: Features continuous 24V DC input overvoltage protection.
  • Signal Filtration: Provides 150 dB common-mode and 50/60 dB normal-mode rejection.
  • Backplane Interaction: Connects to the 1771 chassis, drawing 2.6A at 5V DC.
  • Ladder Logic Instructions: Uses Block Transfer Write (BTW) and Block Transfer Read (BTR).
  • Network Capabilities: Works over Data Highway Plus (DH+), Remote I/O (RIO), ControlNet, and DeviceNet.
  • Field Wiring: Connects through a detachable 1771 field wiring arm for easy swaps.
Description
The Allen-Bradley 1771-NBSC/C is an analog I/O module that is part of the Allen-Bradley 1771-N series of input/output modules. The 1771-NBSC/C features six 4-20mA current inputs and two 0-25mA current outputs, making it a versatile solution for mixed-signal analog control applications. The maximum current drawn by the 1771-NBSC/C I/O module from the chassis backplane is 2.6A, and the amount of power it dissipates during operation is 13W. The 1771-NBSC/C is compatible with the Allen-Bradley PLC-3, PLC-5, and the PLC-5/250 programmable controllers, providing seamless integration into legacy Rockwell Automation control systems.

This analog I/O module is specifically designed to handle precise current loop signal processing in industrial automation environments, solving the challenge of interfacing field analog sensors and actuators with programmable logic controllers. The 1771-NBSC/C enables accurate data acquisition from process transmitters and precise control output to final control elements, bridging the gap between continuous process variables and discrete digital control systems.

The 1771-NBSC/C is widely applied in process control industries such as oil and gas, chemical processing, water and wastewater treatment, and pharmaceutical manufacturing, where accurate analog signal conditioning is critical for maintaining process stability and product quality. The 1771-NBSC/C is also commonly used in power generation facilities, pulp and paper mills, and food and beverage production lines that rely on continuous monitoring and control of temperature, pressure, flow, and level variables.

For installation and integration, the 1771-NBSC/C should be used with the RTP-4 device. Power should be disconnected before removing or installing the 1771-NBSC/C module in the I/O chassis to prevent electrical hazards and protect the module circuitry. The 1771-NBSC/C can perform optimally in industrial environments where the ambient temperature range is 0-60°C (32-140°F) at 5-95% relative humidity. When integrating the 1771-NBSC/C, ensure proper grounding and shielding of analog signal cables to minimize electromagnetic interference and maintain signal integrity.
Revisions

Revision Part #

Also known as

1771-NBSC Ser A
1771-NBSC/A, Series A, Rev A
1771-NBSC Ser B
1771-NBSC/B, Series B, Rev B
Alternative Names
1771-NBSC 1771-N8SC 1771N8SC 1771NBSC 177I-NBSC 177INBSC I771-NBSC 1771-NIS 1771-NB4S
Technical notes
The 1771-NBSC/C Sourcing Input Module belongs to the Allen Bradley PLC 5N series analog I/O modules. It has 6 inputs, 2 outputs, a backplane current of 3.0 amps, and supports BDC or natural binary data format.
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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.
What is the primary function of the Allen-Bradley 1771-NBSC/C module?
The Allen-Bradley 1771-NBSC/C is designed for precise analog signal conversion and loop power distribution within PLC-based control systems. By combining high-resolution analog inputs and outputs in a single module, it helps improve signal integrity and reduces the effects of signal attenuation in long-distance industrial applications.
What types of applications is the 1771-NBSC/C commonly used in?
The module is widely used in process automation industries such as chemical processing, water and wastewater treatment, and oil and gas refining. Its precise measurement and control capabilities make it suitable for monitoring and regulating critical process variables.
How does the 1771-NBSC/C minimize electrical noise?
The module is engineered to operate effectively in electrically noisy industrial environments. It offers a normal mode rejection ratio of at least 50/60 dB and a typical common mode rejection ratio of 150 dB. Combined with low offset and gain drift characteristics, these features help maintain measurement accuracy over time.
What requirements should be considered when installing 1771-NBSC/C?
Proper installation requires the use of an RTP-4 termination panel for field wiring connections. Before installing or removing the module, all chassis power must be disconnected to prevent electrical damage and ensure personnel safety.

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