The Siemens 6ES7231-7PB22-0XA0 is a 2-channel RTD (Resistance Temperature Detector) analog input expansion module from the SIMATIC S7-200 product line. It is designed exclusively for use with S7-22X CPUs and provides high-precision temperature measurement for Pt, Ni, and Cu resistance sensors. This module is not compatible with S7-200 SMART controllers .
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