Siemens simatic s7 200 em 231 rtd temperature measuring module siemens 6es7 231 7pb22 0xa0 an rtd temperature measuring module designed for use in the s7 200 family of plcs the unit accepts the most popular temperature sensors enabling the swift and accurate capturing of temperature data siemens 6es7 231 7pb22 0xa0 em 231 rtd temperature measuring module