Apparatus is disclosed for controlling and monitoring the operation of load means that cyclically operate a load device, such as the dosage supply means of a clinical analyzing system. The load means includes a load motor the operation of which is initiated by an actuating switch that is operated by synchronously-driven program means to initially energize the load motor, whereupon a self-latching holding switch is operated from a first condition to a second condition to maintain the load motor energized throughout the remainder of the operating cycle of the load device. Monitor switch means are driven by the program means to periodically ascertain whether or not the holding switch -- and, consequently, the load device -- is in the desired condition at the predetermined time. Display means of the signal lamp type are operated by the monitor switch means to afford a visible indication of the occurrence of faulty operation of the load device, and scale and pointer means are driven by the program means to indicate the time of occurrence of the fault relative to the operating cycle of the load device.
