Programmable Logic Controller

Definition

A PLC is a digitally operational electronic equipment which uses programmable memory of internal storage of instructions to implement a specific function.

The PLC Processor

The processor is programmable, and since it can perform many logic and arithmetic functions its also known as the Microprocessor.

Its classified as per bit size and clock speed

 

 

The bit size determines the no. of bits of data the microprocessor can manipulate and clock speed determines the speed of execution of the instruction.

The ROM with fixed operating system program interfaces to the control section. It manages the operation of the PLC.

The Control Section, contains a Control unit with storage registers. The Control Section determines which operating sections are to be functional, in what order and for how long.

The I/P Scan block, scans the I/Ps and places the I/p statuses in the Ram Memory, when required to do so.

After analysis the Logic Scan updates the O/P Scan Block to the Appropriate state and changes the O/P respectively.

The O/P Scan Block then scans the O/P and updates their statuses in the RAM.

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