HD bus terminals are high-density, with 16 digital I/O channels in the housing of a 12 mm electronic terminal block. Using Beckhoff bus couplers or DIN-rail-mounted controllers, the HD terminals are compatible with almost every major fieldbus. HD terminals are available in Beckhoff bus and EtherCat versions and are available as 16-channel terminals for digital inputs or outputs, as eight-channel terminals for digital inputs or outputs with two-wire connection or as combination terminals with eight digital inputs and eight digital outputs.