Allen-Bradley 1746-NI4 Analog Input Module
$123.00
$320.00
Description
Allen-Bradley 1746-NI4 Analog Input Module
Configured for analog signal acquisition in SLC 500 I/O scan cycles, the Allen-Bradley 1746-NI4 (1746-NI4 high-resolution input module) provides direct electrical conversion of bipolar voltage and current signals into 16-bit digital values across SLC 500 backplane communication architecture.
Suffix Breakdown & Model Matrix
No suffix segmentation is defined for 1746-NI4. The model is a single catalog entry within the SLC 500 analog input module family.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1746-NI4 |
| Brand | Allen-Bradley |
| Weight | 1.00 lbs |
| Power Consumption | 5 V DC backplane 25 mA; 24 V DC 85 mA |
| Input Channels | 4 differential inputs |
| Input Voltage Range | -10 to 10 V DC |
| Input Current Range | -20 to 20 mA |
| Resolution | 16 bit |
| Conversion Method | Sigma-Delta |
| Step Response | 60 ms |
| Input Impedance | 1 MOhm (voltage); 250 Ohm (current) |
| Backplane Isolation | 710 V DC / 500 V AC (1 min) |
SLC 500 Backplane Signal Conversion Architecture
The 1746-NI4 executes sigma-delta sampling at module level prior to backplane transfer, converting analog differential signals into scaled digital words synchronized with SLC 500 scan timing. Channel acquisition is multiplexed internally, with fixed conversion sequencing per input channel.
Backplane communication uses deterministic scan exchange where converted data is mapped into processor input image tables. Channel isolation is implemented at the front-end signal conditioning stage, separating field-side analog references from backplane logic ground.
Frequently Asked Questions (FAQ)
Q: Does the 1746-NI4 support hot-swapping in an energized SLC 500 chassis?
A: No. Module insertion or removal requires chassis power shutdown due to backplane electrical coupling constraints.
Q: What is the impact of backplane load on system design?
A: The module consumes 25 mA at 5 V DC and 85 mA at 24 V DC, which must be included in total rack power budgeting.
Q: Can voltage and current inputs be used simultaneously across channels?
A: Yes. Each channel supports independent configuration for -10 to 10 V DC or -20 to 20 mA input ranges.
Field Installation Guidelines
Install the module in an SLC 500-compatible rack slot with verified backplane capacity. Ensure field wiring follows differential pair routing practices to reduce common-mode noise. Maintain separation between analog input wiring and high-voltage conductors. Shield termination shall be grounded at a single panel reference point. Avoid exceeding specified input impedance loading limits when connecting external transmitters or signal conditioners.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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