190-9733, Siemens, Siemens AS-I K20 Series Digital I/O Module for Use with Field Work, Digital, 16.5 → 30 V, Brand Siemens, Accessory Type Digital I/O Module, Range AS-Interface Siemens AS-I K20 Series Digital I/O Module for Use with Field Work, Digital, 16.5 → 30 V