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HOW PLC SCAN CYCLE WORKS? Hi Friends … Greetings , Today want to share with you how PLC actually works. PLC’s work on the principal on SCAN CYCLE. Lets find out how PLC Work? It works in Following Stages. STAGE 1.Regenerate input signal   Before the execution of the program, PLC reads the On/Off status of the external input signals into the input signal memory at a time.    The On/Off status of the input signal during the execution of the program will not change the signal status in the input signal memory. The new On/Off status will be read in the next scan.   There will be approximately a 10ms delay from the On→Off or Off→On changes to the status being recognized by the contact in the program. The delay time may be affected by the scan time in the program. STAGE 2.Program processing After the PLC reads the On/Off status of every input signal in the input signal memory, it will start to execute every instruction in the program in order starting from address 0. The e...

In DC circuits this theorem state that the source can transfer maximum power when the total resistance viewed from the load is equal to the value of the resistance of that load.  Applications of Maximum Power Transfer In communication system, maximum power transfer is always sought. For example in public address system, the circuit is adjusted for maximum power transfer by making load resistance (speaker) equal to the source resistance (amplifier). When source and load have the same resistance, they are said to be matched. In car engines, the power delivered to the starter motor of the car will depend upon the effective resistance of the motor and the internal resistance of the battery. If the two resistances are equal, maximum power will be transferred to the motor to turn to the engine.   Proof of Maximum Power Transfer At this point the simple circuit is can be a resemblance of a Thevinin's Circuit diagram where the internal resistance Ri similar to the Theveni...