CONTROL SYSTEM FOR COATING MATERIAL FEEDER

摘要

PURPOSE: To surely prevent the danger of explosion by coating material firing by providing means for connecting respectively multiplexing means with means for forming a plurality of control signals, control signal separating means with control signal multiplexing means and the control signal separating means with means for controlling various types of coating materials. CONSTITUTION: Many kinds of the control signals for controlling the openings of various pneumatic valves V1 to V2N are respectively supplied to many current barriers B2 to B(N+1) and are connected to many optical isolators OPTO 1...OPTON via these current barriers B2 to B(N+1) in order to put these control signals into a safe state. The collectors thereof are connected to respective input terminals AIN...NIN of an N-2N demultiplexer in a hazardous area 12. The output signals which are the control signals separated by this demultiplexer 22 are connected from respective output terminals OUT1,...OUT2N to respective MOS transistor type amplifiers D1...D2N. The respective output terminals respectively supply the separated control signals to the pneumatic valves V1 to V2N.