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Allen Bradley | PLC-5 | 1771-NB4S | Image

Allen Bradley | PLC-5 | 1771-NB4S | Image Allen Bradley | PLC-5 | 1771-NB4S | Image

Includes a PDF Electric and Supply warranty.

(Never Used)


1 In Stock

3 Yr PDF Supply warranty

What is Surplus?



2 In Stock

2 Yr PDF Supply Warranty

What is Refurbished?

Repair Service


Fast Turnaround

2 Yr PDF Supply warranty


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*US continental orders placed Monday-Friday before 4:30pm EST!

Other Available Revisions for the 1771-NB4S 1771-NB4S/A1771-NB4S/B1771-NB4S/C

Common misspellings:
  • l771-NB4S
  • 177l-NB4S
  • 1771-N84S
  • 1771-NBAS
  • 1771NB4S

The Allen-Bradley 1771-NB4S is an analog combination module that has 2 inputs and 2 isolated outputs. The inputs operate at a current range of between 4 and 20 milliamps while the outputs operate within a current range of 0 to 25 milliamps. The 1771-NB4S module exerts a current load of 1.6 Amps on the backplane. The 1771-NB4S module provides the required loop power to the 2-wire transmitters connected to its input terminals. Note that the 1771-NB4S module houses the functionality of the loop power. The module has a power dissipation rating of 7 watts and an operating shock rating of 30 g. When not in operation, the 1771-NB4S can accommodate a shock of 50 g and a temperature of between -40 and +85 degrees Celsius.

The 1771-NB4S module is meant to be operated within environments that have a temperature not exceeding 60 degrees Celsius and not below zero degrees Celsius. If the temperature keeps fluctuating by more than 5 degrees Celsius per minute, the performance of the module will slightly drop during the fluctuation moment. Additionally, the 1771-NB4S module reaches peak performance when operated at environments that have a relative humidity of between 5 and 95% without condensation. The 1771-NB4S supports communication using block transfer for read and write operations. The module has an update duration of 25 milliseconds (max), a 0.01% accuracy at 25 degrees Celsius (min) and 0.08% (max.). The module has a 1000 Volts DC isolation between the output channels and the input channels. Also the 1771-NB4S also has an overvoltage protection rated at 140 Volts AC, RMS.

AB High Res. Iso. Anlg. Mod. 1771N 1771NB 1771NB4

PDF Electric & Supply Inc. sells new, new surplus and refurbished products which are sourced through independent channels. All warranties and support, if applicable, are with PDF Electric & Supply Inc. and not the manufacturer. PDF Electric & Supply Inc. is not an authorized distributor or representative for the listed manufacturers and makes no representations as to any quality control performed by any listed manufacturer on the products. The products listed on this website may vary as to their country of origin; the accessories, and other items included with the product; and the language used on the packaging, the parts, and any related instructions or printed material related to the products. This website is not sanctioned or approved by any manufacturer or tradename listed. Designated trademarks, brand names and brands appearing herein are the property of their respective owners.