Product Introduction
When upgrading aging analog input modules in your SLC 500 system, the Allen-Bradley 1746-NI4 provides a cost-effective and reliable solution. This Analog I/O Module offers four non-isolated differential channels, user-selectable for voltage or current inputs, and occupies a single slot in the chassis. Its 16-bit resolution and fast update time make it ideal for precise monitoring and control applications.
Technical Specifications
The Allen-Bradley 1746-NI4 delivers consistent performance across key parameters:
| Specification |
Value |
| Backplane Current (5 V) |
25 mA |
| Backplane Current (24 V DC) |
85 mA |
| Input Signal Range |
-20 to +20 mA or -10 to +10 V dc |
| Resolution |
16 bits |
| Update Time |
512 microseconds |
| Step Response |
60 milliseconds |
| Bandwidth |
10 Hz |
| Conversion Type |
Delta–Sigma Modulation |
| Cable Lengths |
0.5, 1, 2.5, or 5.0 meters |
| Chassis Slot |
Any I/O slot except slot 0 |
These specifications ensure the 1746-NI4 integrates smoothly into existing SLC 500 architectures.
Industry Applications
The Allen-Bradley 1746-NI4 excels in process monitoring, such as temperature and pressure sensing in chemical plants, and flow control in water treatment facilities. Its differential inputs reject common-mode noise, making it suitable for electrically noisy environments like manufacturing floors.
Compatibility & Integration
This module works with both fixed and modular SLC 500 controllers. It communicates via the backplane and requires no additional protocol converters. Standard cable lengths of 0.5 to 5.0 meters simplify wiring in control panels.
Troubleshooting & Common Issues
A frequent issue is connecting a voltage source to a channel configured for current input. This can cause incorrect readings or module damage. Always verify DIP switch settings on the circuit board before power-up. The built-in LED indicators per channel assist in quick diagnostics.
Selection Guide & Purchasing Advice
Before purchasing the 1746-NI4, confirm your SLC 500 chassis type and available slot. Ensure your controller firmware supports this module revision. For genuine Allen-Bradley 1746-NI4 stock and fast shipping, rely on UBEST Automation. Note: This product is also available at ubest101.myshopify.com.