Introduction to the Allen-Bradley 1746-NO4I
When upgrading your SLC 500 control system, selecting a reliable analog output module is critical. The Allen-Bradley 1746-NO4I provides four 0 to +20 mA current output channels, making it ideal for driving modulating instruments. This module works with both fixed and modular SLC 500 hardware.
Technical Specifications Breakdown
The 1746-NO4I offers 14-bit resolution via R-2R ladder conversion, with an update time of 512 microseconds for all channels. It draws 55 mA at 5 VDC backplane and 195 mA at 24 VDC. The output range is 0 to +20 mA with a full-scale output of 21 mA and overrange capability of 5%. Step response is 2.5 ms at 95%.
Other key specs:
- Current output coding: 0 to +32764
- Backplane isolation: 500 VDC
- Operating temperature: 0 to 60 °C
- Storage temperature: -40 to 85 °C
- Ambient relative humidity: 5 to 95% non-condensing
- Load range: 0 to 500 ohms
- Maximum load reactance: 100 µH
Industry Applications
The 1746-NO4I is commonly used in process control where PID control outputs require precise current signals. Typical applications include controlling valve positioners, VFD speed references, and retransmitting signals for data logging. Its reliable performance ensures minimal downtime in manufacturing environments.
Compatibility & Integration
The Allen-Bradley 1746-NO4I is designed for the SLC 500 platform and compatible with 1746 chassis. It works with both fixed and modular controllers. Use shielded twisted-pair cabling like Belden 8761 for optimal noise immunity.
Selection Guide & Purchasing Advice
Before purchasing, verify your SLC 500 chassis and power supply capacity. The 1746-NO4I requires 55 mA at 5 V and 195 mA at 24 V. If your system is older, consider upgrading to this module for improved reliability. UBEST Automation (ubest101) stocks genuine replacement parts for quick delivery.