Modules and subassemblies consisting of integrated circuits and logic components for electronic controls, light scanners, light scanners provided with incandescent bulbs, light scanners provided with gallium arsenide diodes, light grid switches, light curtains, light grid switches provided with incandescent bulbs, light grid switches provided with gallium arsenide diodes, light transmitters and light receivers for installing light barriers, light transmitters provided with incandescent bulbs, light transmitters provided with gallium arsenide diodes, electro-mechanical transmitters, limit switches, position indicators, namely position transmitters for detecting the positions of servo components, non-contacting electronic transmitters, inductive and capacitive pressure switches, temperature switches, threshold value transmitters, level switches, capacitive or inductive sensors for controlling double arcs, regulators/controllers for electrical drives, speed controllers, current and voltage controllers, controllers for non-electric drives, turbine controllers, electric controllers and control systems composed thereof, using the plug-in card technology, printed circuit boards for insertion into magazines, tiers, module carriers, electric sensors, adapters and converters, as well as devices and equipment consisting thereof for measuring optical and acoustic variables, light intensity meters and light density meters, sound pressure meters and sound intensity meters, devices and equipment composed thereof for measuring mechanical and geometric variables by using photo-electronic measuring techniques, barcoding type strips and barcoding type strips provided with reflectors; housings made of light-weight metal, plastic, and sheet metal for photo-electronic devices, housings and casings for photo-electronic devices and equipment composed thereof