Siemens 6ES7331-7RD00-0AB0 SIMATIC S7, ANALOG INPUT SM 331, OPTICALLY ISOLATATED, 4 AI (Siemens 6ES73317RD000AB0)
Siemens 6ES7331-7SF00-0AB0 SIMATIC S7, ANALOG INPUT SM 331, OPTICALLY ISOLATATED, 8 AI THERMOCOUPLE/4 AI PT100 (Siemens 6ES73317SF000AB0)
Siemens 6ES7332-5RD00-0AB0 SIMATIC S7, ANALOG OUTPUT SM 332, OPTICALLY ISOLATED, 4 AO (Siemens 6ES73325RD000AB0)