{"product_id":"allen-bradley-1746-nr4-rtd-analog-input-module","title":"Allen-Bradley 1746-NR4 RTD Analog Input Module","description":"\u003cdiv\u003eThe Allen-Bradley 1746-NR4 RTD Analog Input Module is a four-channel RTD\/resistance input module for the SLC 500 family, delivering backplane-isolated analog readings from RTD sensors and other resistance inputs to fixed and modular PLC processors. It requires no external power supply, drawing about 50 mA from the backplane at 5 V and 50 mA at 24 V, with a maximum backplane power of 1.5 W. Each of its four channels uses a sigma‑delta ADC to convert resistance inputs into digital data that the processor stores in the module’s image table, and the unit auto‑calibrates when a channel is enabled or when its input type, filter, or excitation current changes; the chassis location is any I\/O slot except slot 0. The NR4 provides a low‑pass digital filter with programmable notch frequencies and offers exceptional noise rejection, with common‑mode rejection between inputs and chassis ground exceeding 150 dB at 50 Hz (and 60 Hz when using the corresponding filter settings) and normal‑mode rejection between the plus and minus inputs over 100 dB at those frequencies. Electrical limits include a maximum common‑mode voltage of ±1 V and a permanent overload rating of ±5 V and ±5 mA. Update times range from 17 ms to 1.2 s, and bandwidth is specified from 2.62 Hz (10 Hz filter) up to 65.5 Hz (250 Hz setting). Operating temperature is 0 to 60 °C (storage −40 to 85 °C). The 1746-NR4 is a robust choice for four RTD or resistance inputs in SLC 500 systems seeking precise, stable measurements with strong isolation and configurable filtering.\u003c\/div\u003e","brand":"Allen-Bradley","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51659710955822,"sku":null,"price":956.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_51b9cc24-c149-41b7-b850-258beefbde78.jpg?v=1769529781","url":"https:\/\/plgautomation.com\/products\/allen-bradley-1746-nr4-rtd-analog-input-module","provider":"PLG Automation ","version":"1.0","type":"link"}