PRESS CONTROL SEQUENCY USING PROGRAMMABLE ARRAY LOGIC

摘要

The programmable array logics (PAL) are used to form a sequence control circuit. Output signals of the PAL internal circuit are input to an input unit of the PAL IC according to the switch action of the control sequence circuit. The signals are transmitted to drive PAL ICs (16H2, 14H4-1, 14H4-2, 14H4-4) and when the input condition is satisfied the drive signals are transmitted to output units. The output control signals are fed back to a feed back unit according to the condition of the output units. A cadmium sulfide sensor (cds) is connected to a collector of a transistor (TR2) so that when the power is applied to the collector, a Ne on lamp illuminates, the sensor detects the light, and then the detection signal is transmitted to the output terminal.