Siemens SIMATIC S7-300 SM 331 Ex Analog input module, 24VDC, 4 analog input
Siemens SIMATIC S7-300 SM 331 Ex Analog input module, 24VDC, 8 thermocouple input
Siemens SIMATIC S7-300 SM 332 Ex Analog output module, 24VDC, 8 analog output