There are four new sets of code for the free Add-On Instructor (AOI) software that offloads Allen-Bradley ControlLogix, CompactLogix, and DriveLogix controllers. AOI also offers special functions through I/O system controllers, analog, digital, and specialty modules. The software supports the Frequency Counter Module, 2-channel and 4-channel 0-20 mA input modules, and 2-channel 0-10 Vdc output module. Depending on the Allen-Bradley PLC capacity, bus couplers and specialty I/O can be integrated. The software is documented and retains the RS-Logix graphical user interface.