FIELD: automatic control and telemechanics. SUBSTANCE: monitoring device for controlled switches whose outputs are connected through diodes to final elements has checking unit, first ON-operation unit which couples common points of controlled switches to first bus of power supply, second ON-operation unit inserted in circuit coupling common points of final elements in series with second bus of power supply, and current-setting components, such as resistors, some of whose leads are connected to outputs of control switches and other leads, to second bus of power supply; checking unit input is connected in parallel with first ON-operation unit. EFFECT: provision for serviceability check of each output stage without interfering with operation of control system incorporating monitoring device at the same time indirectly checking control system proper. 1 dwge
