Eight Analog Input Channels
The Allen-Bradley 1746-NI8 provides eight configurable analog input channels for acquiring voltage and current signals in compatible SLC 500 programmable controller systems.
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Allen-Bradley
Allen-Bradley 1746-NI8 SER A SLC 500 Analog Input Module
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PRODUCT DOCUMENTATION
Product Information
Technical specifications, features, applications and purchasing information.
Technical Specifications
| Brand | Allen-Bradley |
| Model Number | 1746-NI8 |
| Product Category | Analog Input Module |
| Product Family | SLC 500 |
| Number of Input Channels | 8 |
| Input Signal Types | Configurable DC Voltage and Current |
| Selectable Voltage Input Ranges | -10 to +10 VDC; 0 to 10 VDC; 0 to 5 VDC; 1 to 5 VDC |
| Selectable Current Input Ranges | -20 to +20 mA; 0 to 20 mA; 4 to 20 mA; 0 to 1 mA |
| Analog-to-Digital Converter Resolution | 16-Bit |
| Voltage Input Resolution | 1 mV |
| Current Input Resolution | 1 µA |
| Current Input Impedance | 250 Ω |
| Voltage Input Impedance | 1 MΩ |
| Input Filter Frequencies | 1, 2, 5, 10, 20, 50 and 75 Hz |
| Module Update Time | 0.75 ms per Enabled Channel |
| Current Input Accuracy | ±0.05% for 0–20 mA, 4–20 mA and ±20 mA ranges over 0–60°C; ±0.5% for 0–1 mA |
| Voltage Input Accuracy | ±0.1% over 0–60°C |
| Backplane Current at 5 VDC | 200 mA |
| Backplane Current at 24 VDC | 100 mA |
| Maximum Backplane Power Consumption | 3.4 W |
| Input-to-Backplane Isolation Test | 500 VAC / 710 VDC for 60 Seconds |
| Calibration | Continuous Automatic Calibration |
| Chassis Installation | Compatible SLC 500 I/O Slot Except Slot 0 |
| Status Indicators | 9 Green LEDs: 8 Channel Indicators and 1 Module Indicator |
| Removable Terminal Block | 1746-RT25G |
| Manufacturer UPC | 662072678039 |
| Product Lifecycle Status | Discontinued September 30, 2024 |
| Manufacturer User Manual | Rockwell Automation Publication 1746-UM020 |
| Manufacturer Installation Instructions | Rockwell Automation Publication 1746-IN006 |
Key Features
Multiple Voltage and Current Ranges
Selectable input ranges include 0–10 VDC, ±10 VDC, 0–5 VDC, 1–5 VDC, 0–20 mA, 4–20 mA, ±20 mA and 0–1 mA for connection to compatible industrial sensors and transmitters.
16-Bit Analog Conversion
The module incorporates a 16-bit analog-to-digital converter using successive approximation technology to convert analog process signals into controller-readable data.
Programmable Input Filtering
Seven selectable digital filter frequencies allow input response and filtering to be configured according to application requirements. Module update time is specified as 0.75 ms per enabled channel.
Continuous Automatic Calibration
Automatic calibration and channel status indication support measurement monitoring and maintenance of existing industrial control systems.
SLC 500 Chassis Integration
The 1746-NI8 mounts in a compatible SLC 500 I/O slot other than slot 0 and draws power from the controller backplane. Confirm available backplane power and PLC configuration before installation.
Applications
- SLC 500 PLC analog input expansion
- Industrial pressure transmitter monitoring
- Temperature transmitter signal acquisition
- Flow and liquid level measurement systems
- Industrial process data collection
- Manufacturing equipment monitoring
- Legacy automation system maintenance
- SLC 500 analog module replacement projects
Purchase Information
We support online purchase of the Allen-Bradley 1746-NI8 Analog Input Module. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
Frequently Asked Questions
What is the Allen-Bradley 1746-NI8?
It is an eight-channel analog input module for compatible Allen-Bradley SLC 500 programmable controller systems.
How many analog input channels does 1746-NI8 provide?
The module provides eight configurable analog input channels for DC voltage or current signals.
Does the 1746-NI8 support 4–20 mA signals?
Yes. The module supports 4–20 mA current inputs as well as 0–20 mA, ±20 mA and 0–1 mA input ranges.
Which voltage ranges are supported?
Selectable voltage ranges include -10 to +10 VDC, 0–10 VDC, 0–5 VDC and 1–5 VDC.
What is the analog conversion resolution?
The 1746-NI8 uses a 16-bit analog-to-digital converter. Published input resolutions are 1 mV for voltage and 1 µA for current.
What power does the module require?
It receives power through the SLC 500 backplane and draws up to 200 mA at 5 VDC and 100 mA at 24 VDC, with maximum backplane power consumption of 3.4 W.
Does the module have programmable input filtering?
Yes. Supported digital filter frequencies are 1, 2, 5, 10, 20, 50 and 75 Hz.
Can the 1746-NI8 be installed in any SLC 500 chassis slot?
The module may be installed in a compatible I/O slot other than slot 0, subject to the controller and chassis configuration.
Does 1746-NI8 provide analog outputs?
No. It is an analog input module with eight input channels and no analog output channels.
Does the module require manual calibration?
The manufacturer specifies continuous automatic calibration. Installation, configuration and diagnostic procedures should follow the Rockwell Automation user manual.
Is the Allen-Bradley 1746-NI8 discontinued?
Yes. Rockwell Automation lists September 30, 2024 as its discontinuation date and categorizes the replacement process as an engineering replacement.
What should be checked before ordering?
Confirm the exact model 1746-NI8, SLC 500 chassis and processor compatibility, required eight input channels, voltage and current signal ranges, terminal block availability, backplane power capacity, software configuration and existing machine requirements.
Need help confirming a model?
Send us your part number and technical requirements.
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