A Siemens Digital Input (DI) Card is a hardware component that allows a Siemens Programmable Logic Controller (PLC) to receive and interpret binary signals from field equipmentAug 21st, 2026 4:57 PMShare this on :KeywordsSiemens Digital Input Cardshardware component that allowsSiemens Programmable Logic Controller (PLC)binary signals from field equipmentSiemens Digital Input (DI) Card