The Gira Binary Input 8-gang 12–48 V AC/DC, potential-free (2128 00), provides eight input channels for bringing compatible external signals into a KNX installation. It can be used to integrate suitable contacts or low-voltage control signals into automation logic, with each input configured through the applicable ETS application. The specified input range is 12–48 V AC/DC. Technical data lists a maximum KNX bus current consumption of 15 mA and a fitting width of 72 mm, or four DIN modules. A separate 24 V DC SELV auxiliary output is rated at up to 4 mA. Check wiring diagrams, input requirements and limits in the manufacturer’s documentation before connecting field devices.