Siemens sim 1274 simulator module siemens 6es7274 1xh30 0xa0 the siemens 6es7274 1xh30 0xa0 is a 14 channel sim 1274 simulator module for simatic s7 1200 it provides the user with the opportunity for testing user programs during commissioning and ongoing operation the input simulator is mounted on the terminal block instead of the digital input the cpu reads the set input signal statuses and processes them in the user program the subsequent response of the controller allows conclusions t