Allen Bradley 1771-NIS/B High-resolution Analog Input Module

Applications

• High-precision process measurement systems
Used to acquire accurate 4–20 mA analog signals from transmitters in pressure, flow, level, and temperature monitoring applications.

• PLC-5 and 1771 rack-based control systems
Integrated into Allen-Bradley PLC-5 architectures for legacy industrial automation and process control environments.

• Power plant instrumentation monitoring
Supports stable data acquisition from field instrumentation in generation units, boiler systems, and auxiliary processes.

• Chemical and continuous process industries
Used for high-resolution measurement of process variables where signal accuracy and stability are critical.

• Industrial SCADA and monitoring systems
Provides reliable analog input data for supervisory control and data acquisition platforms.

• Retrofit and maintenance of legacy installations
Commonly used in maintaining or extending installed base PLC-5 systems without full system replacement.

Advantages

• High-resolution analog signal acquisition
Provides precise measurement of low-level current signals with strong resolution performance.

• Eight-channel current input design
Supports multiple field instruments within a single module footprint, improving system density.

• Integrated loop power supply
Supplies power to connected 2-wire transmitters, reducing external wiring complexity.

• Strong noise immunity
Designed with high common-mode and normal-mode rejection for industrial environments.

• Stable PLC-5 system integration
Fully compatible with 1771 I/O chassis architecture for legacy system continuity.

• Reliable long-term operation
Built for continuous industrial use in harsh environments with minimal drift over time.

Technical FAQs

Q1: What is the main function of the 1771-NIS/B module?
It converts high-resolution analog current signals into PLC-5 readable data.

Q2: How many input channels does it support?
It provides 8 analog current input channels.

Q3: What signal range does it accept?
It supports standard 4–20 mA process control signals.

Q4: Does it provide loop power?
Yes, it supplies loop power for connected 2-wire transmitters.

Q5: What system is it designed for?
It is designed for Allen-Bradley PLC-5 and 1771 I/O chassis systems.

Q6: Is it isolated?
Yes, it includes isolation to improve signal integrity and protection.

Q7: Is it suitable for modern PLC systems?
It is mainly used in legacy PLC-5 installations.

Q8: What happens if one channel fails?
Only the affected channel is lost; other channels continue operating normally.

Q9: Does it require configuration?
Yes, it is configured through PLC-5 block transfer programming.

Q10: Is it still in production?
It is primarily a legacy module used for replacement and maintenance.