1771-NBSC Allen-Bradley N-series High Resolution Analog Combination Module

Product Parameters

Basic Information:

Manufacturer: Allen-Bradley (Rockwell Automation)

Model: 1771-NBSC (Series B, etc.)

Type: High-Resolution Isolated Analog Combination I/O Module

Compatible Systems: PLC-3, PLC-5, PLC-5/250 programmable controllers

Installation: Occupies one slot in a 1771 I/O chassis, compatible with 1771-A1B, A2B, A3B, A3B1, A4B, AM1, AM2 chassis (not compatible with 1771-A1, A2, A4)

Module Location: Can be installed in any slot except those reserved for processors or adapters

Electrical Parameters:

Inputs:

Number: 6 sourcing current inputs (4-20 mA)

Input Range: 0.1–21 mA

Input Resolution: 330 nA/bit at 16 bits unipolar

Input Impedance: Maximum 300 ohms

Overvoltage Protection: 24V DC continuous

Open Input Detection Time: 5 seconds

Normal Mode Rejection: 50/60 dB minimum

Common Mode Rejection: 150 dB typical

Offset Drift: ±200 nA/°C

Gain Drift: ±95 ppm/°C

Under/Over Range Threshold: 3.2 mA (under), 21 mA (over)

Outputs:

Number: 2 current outputs (0-25 mA)

Output Range: 0–25 mA

Output Resolution: 3.2 µA/bit at 13 bits unipolar

Output Impedance: >1 MΩ

Output Drive Capability: 20 mA into 0–1 kΩ;  25 mA into 0–700 Ω

Output Overvoltage Protection: 140V AC RMS (continuous)

Output Offset Drift: ±1.0 µA/°C

Output Gain Drift: ±50 ppm/°C

Calibration Values: 0.5 mA / 22.0 mA

Backplane Current: 2.6 A @ 5V DC (maximum)

Power Dissipation: 13 W

Thermal Dissipation: 44.4 BTU/hour (maximum)

Loop Power Supply: 20–30V DC (0–20 mA) for 2-wire transmitters

Environmental Specifications:

Operating Temperature: 0°C to 60°C (32°F to 140°F)

Storage Temperature: -40°C to 85°C (-40°F to 185°F)

Relative Humidity: 5% to 95% (non-condensing)

Connection and Wiring:

Wiring Arm: 1771-WH (removable, supports RIUP—Removal and Insertion Under Power)

Recommended Device: RTP-4 (Remote Termination Panel) for optimal performance

Keying Positions: 10-12 or 14-16 (prevents incorrect installation)

Cable Assemblies: 1771-NC6 (6 ft) or 1771-NC15 (15 ft) for RTP connections

Data Format: BDC (Binary Coded Decimal) or Natural Binary

Other:

Certifications: c-UL, C-TICK, CE

Isolation: Optoelectrical isolation for protection against electrical transients

Indicators: Status LEDs for module operation and channel status

Addressing: Supports 1/2 slot, 1 slot, and 2 slot I/O addressing

Functions

Analog Input/Output Processing:

Inputs: The 1771-NBSC features 6 high-resolution current inputs (4-20 mA), ideal for interfacing with 2-wire transmitters (e.g., pressure, temperature, or flow sensors).  It provides loop power for connected devices, simplifying wiring and setup.

Outputs: Two 0-25 mA current outputs with high resolution (3.2 µA/bit) for precise control of actuators or other analog devices.

Loop Power Supply:

Supplies 20–30V DC to power 2-wire transmitters, eliminating the need for external power supplies in many applications.

High-Resolution Signal Processing:

Offers 16-bit unipolar resolution for inputs (330 nA/bit) and 13-bit unipolar resolution for outputs (3.2 µA/bit), ensuring precise data acquisition and control.

Supports scaling, high/low alarms, and digital filtering for enhanced signal accuracy.

Sinking and Sourcing Capability:

The module supports both sinking and sourcing configurations, providing flexibility for various industrial applications.

Fault Detection and Protection:

Detects open inputs within 5 seconds and provides 24V DC input overvoltage protection.

Output overvoltage protection rated at 140V AC RMS ensures durability in harsh environments.

System Integration:

Compatible with PLC-3, PLC-5, and PLC-5/250 controllers, integrating seamlessly with ControlNet, DeviceNet, and Remote I/O networks.

Supports block transfer programming for efficient data exchange with PLC processors.

Modular Design:

The 1771-WH wiring arm allows easy module replacement without disconnecting wiring, reducing downtime.

Optoelectrical isolation and input filtering minimize electrical noise and transients.

Application Scenarios

Industrial Process Control:

Used in applications requiring precise analog signal processing, such as monitoring pressure, temperature, or flow in chemical plants, oil and gas facilities, or water treatment systems.

The loop power supply simplifies integration with 2-wire transmitters, reducing installation complexity.

Manufacturing Automation:

Suitable for controlling analog actuators or valves in automated production lines, such as in automotive manufacturing, food processing, or packaging systems.

High-resolution inputs ensure accurate feedback from sensors for quality control.

Distributed Control Systems:Deployed in distributed I/O setups via ControlNet or Remote I/O networks, enabling centralized control of remote analog devices in large-scale facilities.

Legacy System Maintenance:Ideal for maintaining or upgrading PLC-5-based systems in industries with existing 1771 I/O chassis installations.

Advantage Products:

All items are Distributor Ready-stock Genuine Brand-new Supplying, please inform us if the other conditions are needed, Used, Open-box, Refurbished, etc.

Many Available just wait for you, feel free to ask to get better deal!!!

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