Siemens 6ES7231-7PD22-0XA0INPUT MODULE SIMATIC S7 200 ANALOG EM 231 4 POINT THERMOCOUPLE 24 VDC ONLY FOR S7 22X CPU What type of I O module is this? This is an analog input module designed for Siemens S7 1200 PLC systems. What signal types does this module support? It supports analog input signals such as voltage and current, depending on configuration. How many analog channels are available? The module provides multiple analog input channels for sensor and process signal