CVM1-PA208 Omron, CVM1-PA208 Datasheet - Page 20

• Manufacturer Part Number: CVM1-PA208
• Description: CV/CVM1 POWER SUPPLY, AC
• Manufacturer: Omron

Specifications of CVM1-PA208

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

1-3
Block Diagram of PC
Execution Cycle
Cycle Time
4
PC Operation
PC Operation
Signals
from
switches,
sensors,
etc.
1, 2, 3...
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.
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.
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
CVM1D Operation Manual for details.
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
1. Common (or overseeing) processes, such as watchdog timer operation and
2. Data input and output.
3. Program execution.
4. Programming Device servicing.
given input signal?
Input
testing the program memory.
Power Supply
Programming
Memory
CPU
Device
Output
Signals to
Solenoids,
motors,
etc.
Section
1-3