1771-ir the allen-bradley / rockwell automation 1771-ir rtd input module houses 6 rtd inputs (three-wire). Voltage range of 1771ir is 100 platinum and 10 copper Best price+one year warranty+in stock+new+original 1771-ir the allen-bradley / rockwell automation 1771-ir rtd input module houses 6 rtd inputs (three-wire). Voltage range of 1771ir is 100 platinum and 10 copper