CV500-SLK21 datasheet(17/182 Pages) OMRON

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PC Operation

PCs operate by monitoring input signals and providing output signals. When

changes are detected in input signals, the PC reacts through the user-pro-

grammed internal logic to produce output signals. The PC continually executes

the program in its memory to achieve this control.

Block Diagram of PC

Power Supply

Input

Output

CPU

Memory

Programming

Device

Signals

from

switches,

sensors,

etc.

Signals to

Solenoids,

motors,

etc.

A program for your applications must be designed and stored in the PC. This

program is then executed as part of the cycle of internal operations of the PC.

Execution Cycle

When a PC operates, i.e., when it executes its program to control an external

system, a series of operations are performed inside the PC. These internal oper-

ations can be broadly classified into the following four categories. Refer to the

CV-series PCs Operation Manual: Ladder Diagrams for details.

1, 2, 3...

1. Common (or overseeing) processes, such as watchdog timer operation and

testing the program memory.

2. Data input and output.

3. Program execution.

4. Peripheral device servicing.

Cycle Time

The total time required for a PC to perform all these internal operations is called

the cycle time.

Timing is one of the most important factors in designing a Control System. For

accurate operations, it is necessary to have answers to such questions as these:

• How long does it take for the PC to execute all the instructions in its memory?

• How long does it take for the PC to produce a control output in response to a

given input signal?

PC Operation

Section 1-3

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