The Allen-Bradley/Rockwell Automation 1745-E106 expansion unit is used in combination with processor units from the Allen-Bradley SLC 100 and SLC 150 series. The programmable controllers from the SLC 100 series are based on microprocessor technology and their main functional components include counters, timers, relay logic, and sequencers. The uses of these controllers includes use in machine assembly and use with molding and casting machines. The main purpose of the 1745 expansion unit is to expand the number of I/O circuits if the application requires it. The maximum number of I/O circuits is 112. The users tend to combine various SLC 100 and SLC 150 expansion units in order to get the best I/O combination for a specific application.

The 1745-E106 expansion unit simplifies the process of assigning addresses due to the use of address blocks. Generally, the SLC 100 expansion units offer 3 different I/O configurations and they feature 10 input circuits and 6 output circuits. In addition to that, the relay output unit provides 12 output circuits and no circuit for input. It is important to mention that the unit has 0 output terminals and 8 input terminals. Also, the unit’s analog input provides 4 analog input circuits and no output circuits. The analog input circuits have a pair of set points for each input. The 1745-E106 expansion unit with analog input has an input power range of 0 to 10 Volts DC. The voltage ranges of the incoming power connections for this model are 85 to 132 Volts AC and 170 to 265 Volts AC, with an input frequency of 50 to 60 Hertz. The unit is equipped with self-lifting pressure plates that are used for the simple insertion of wires and secure connections. The 1745-E106 expansion unit also features LED indicators for input and output status updates. The unit comes with an Allen-Bradley 1745-C2 communication interconnect cable that has a 10-pin connector on each end. This cable is 470 millimeters (18.5 inches) long and it does not affect the integrity of data exchange between the processor and expansion units.