Programmable Logic Controller (PLC): Programmable Logic Controller (PLC) is a specialized computer used in industrial segments to control machines and process. PLC is program that consists of a set of instructions which resembles the controlling functions needed to perform specific tasks. The function of PLC is similar to that of a relay and hence, in an industrial segment a relay is greatly replaced by a suitable PLC. When compared to general Personal Computer (PC), a PLC is available in small and tiny sizes. The basic architecture of a PLC consists of an input-output interface module and a small Central Processing Unit (CPU) that runs by control programming language. Timer: A timer refers to an instruction which waits for an amount of time before performing something. A timer counts fractions of seconds or seconds using the internal CPU clock. There are mainly three types of PLC timer delays, such as ON-delay timer, OFF-delay timer, and retentive timer ON. Mechanical timing relays: The main purpose of mechanical timing relays is to delay the opening and closing of contacts for circuit control. Its operation is almost similar to that of a control relay. The only difference is that the contacts of a mechanical timing relay are used to operate at a preset time interval, that is, after the coil is energized or de-energized. One example for mechanical timing relay is Pneumatic timing relay.

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Programmable Logic Controller (PLC):

Programmable Logic Controller (PLC) is a specialized computer used in industrial segments to control machines and process.

PLC is program that consists of a set of instructions which resembles the controlling functions needed to perform specific tasks.

The function of PLC is similar to that of a relay and hence, in an industrial segment a relay is greatly replaced by a suitable PLC.

When compared to general Personal Computer (PC), a PLC is available in small and tiny sizes.

The basic architecture of a PLC consists of an input-output interface module and a small Central Processing Unit (CPU) that runs by control programming language.

Timer:

A timer refers to an instruction which waits for an amount of time before performing something.

A timer counts fractions of seconds or seconds using the internal CPU clock.

There are mainly three types of PLC timer delays, such as ON-delay timer, OFF-delay timer, and retentive timer ON.

Mechanical timing relays:

The main purpose of mechanical timing relays is to delay the opening and closing of contacts for circuit control.

Its operation is almost similar to that of a control relay.

The only difference is that the contacts of a mechanical timing relay are used to operate at a preset time interval, that is, after the coil is energized or de-energized.

One example for mechanical timing relay is Pneumatic timing relay.

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