In industrial world, increasing quality and productivity from product result has needed to control process of industrial machines and monitoring the machine process. General, controlling the machine is setting up by some group electronics devices and preventing transition at production processing.
In last year, automatic industry has only using electronic board as control system. This board is needed many interconnection between relay to make the system can work. In other word, for this connection has many cables for connect each other relay. Relay that using in this connection is hundreds and called Ladder Schematic.
Ladder schematic is displaying the switch, sensor, motor, and relay. All devices is connection as one wiring. The problems for this wiring, if one of the relay has broken, so the process production will be stopped automatically. The solution for this problems is using a electronics devices that is called as Programmable Logic Control or PLC unit.
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