AMIKON Industrial Supply Allen-Bradley 1756-TBE ControlLogix Extended Depth Terminal Block Housing — an extended-depth housing option for applications requiring additional wiring room around the removable terminal block. CONTROLLOGIX ACCESSORY 01 Product Overview The 1756-TBE is an extended-depth terminal block housing for the ControlLogix I/O system. It fits over a wired removable terminal block (RTB), helping protect the wiring connections when the RTB is seated on the I/O