HD bus terminals have 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 terminals are compatible with almost every major fieldbus. The terminals come 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.