Product Overview
With its 16-bit resolution and fast 6 ms update time, the Allen-Bradley 1746-NI8 Analog I/O Module delivers precise analog signal conversion for time-critical SLC 500 applications. This 1746-NI8 module provides eight individually selectable voltage or current input channels, reducing the need for multiple modules and simplifying wiring. By integrating this module into your control system, you achieve lower total cost of ownership through reduced downtime and improved process accuracy.
Key Technical Specifications
The Allen-Bradley 1746-NI8 offers the following critical parameters from the product datasheet:
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Inputs: 8 non-isolated differential channels; voltage or current selectable
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Input Signal Category: -20 to +20 mA or -10 to +10 V DC
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Resolution: 16 bits
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Update Time: 6 milliseconds
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Bandwidth: 1-75 Hz with programmable filter frequencies (1, 2, 5, 10, 20, 50, 75 Hz)
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Backplane Current: 200 mA at 5 V DC, 100 mA at 24 V DC
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Backplane Power Consumption: 14 Watts maximum
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Step Response: 0.75-730 milliseconds
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Input Impedance: 250 Ohms
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Data Formats: Engineering Units, Scaled for PID, Proportional Counts (-32,768 to +32,767), Proportional Counts (User Defined Range, Class 3 only)
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LED Indicators: 9 green status LEDs (8 for channels, 1 for module)
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Wire Size: 14 AWG
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Isolation: 750 V DC / 530 V AC tested for 60 seconds
Real-World Applications
Industries using the 1746-NI8 benefit from its fast conversion and flexible input ranges. Typical use cases include:
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Process Monitoring: In chemical plants, the 1746-NI8 reads 4-20 mA signals from pressure and flow transmitters with 16-bit accuracy, enabling precise control loop tuning and reducing material waste.
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Machine Automation: For packaging machinery, the module's 6 ms update time allows rapid detection of analog sensor changes, supporting high-speed quality inspection without delays.
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Energy Management: The 0-10 V DC input range suits temperature and humidity sensors in HVAC systems, contributing to energy savings through accurate environmental control.
Reliability and Cost Efficiency
The 1746-NI8 module performs continuous autocalibration, maintaining measurement accuracy over time and reducing calibration downtime. Its low thermal dissipation of 3.4 Watts and wide operating temperature range (0 to 60°C) ensure stable operation even in demanding industrial environments. By choosing the Allen-Bradley 1746-NI8, you minimize spare part inventory and prolong the life of your SLC 500 system, delivering a strong return on investment.
Compatibility and System Integration
The 1746-NI8 installs in any I/O slot (except slot 0) of SLC 500 fixed or modular chassis. It is compatible with SLC 5/01, 5/02, 5/03, 5/04, and 5/05 processors. For advanced data handling, Class 3 operation is supported on SLC 5/02 and later processors. The module uses a removable 18-position terminal block for easy wiring and replacement. Cable requirements: Belden 8761 or similar, with up to 14 AWG wire per terminal.
Purchasing Guide
When ordering the Allen-Bradley 1746-NI8, verify your system's backplane current capacity (200 mA at 5 V, 100 mA at 24 V). Consider adding a spare module to reduce potential downtime. UBEST Automation stocks genuine 1746-NI8 modules and offers competitive pricing. For bulk orders or technical inquiries, contact our team at ubest101.myshopify.com.