SimStep Advanced Motion Control Technology by Mclennan Servo Supplies. SimStep is Mclennan's plug-n-run control system for 17-34 frame size motors. The system features programmable positioning, optional closed loop control, up to 99 daisy chained units and world-wide supply voltage capability. Also available for download are our SimStep Brochure, Getting Stared with SimStep guide, SimStep user manual and McTerminal communication program. SimStep plug-n-run control systems from Mclennan Servo Supplies