The SIMATIC S7-1500 DI 16x230 V AC BA (6ES7521-1FH00-0AA0) is a digital input module from Siemens, designed for SIMATIC S7-1500 systems. \nThis module features 16 input channels grouped in sets of 4, operates at 230 V AC, and has a typical input delay of 20 ms. It supports \nType 1 inputs (IEC 61131). The front connector (screw terminals or push-in) must be ordered separately. With a net weight of 0.342 kg and packaging dimensions \nof 15.10 x 15.20 x 4.70 cm, its compact design helps save space in control cabinets. DIN rail mounting is supported. It is used in \nindustrial automation systems, particularly for processing high-voltage digital signals.