C500IDA02 Omron, C500IDA02 Datasheet - Page 18

• Manufacturer Part Number: C500IDA02
• Description: ID SENSOR ID ADAPTER
• Manufacturer: Omron

Specifications of C500IDA02

• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

How Does a PC Work?
1-3
Block Diagram of PC
Scanning Cycle
Cycle Time
How Does a PC Work?
Signals
from
switches,
sensors,
etc.
1, 2, 3...
PCs operate by monitoring input signals and providing output signals. When
changes are detected in the signals, the PC reacts, through the user-pro-
grammed internal logic, to produce output signals. The PC continually scans 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, that is, when it executes its program to control an external
system, a series of operations are performed inside the PC. These internal
operations can be broadly classified into the following four categories:
The total time required for a PC to perform all these internal operations is called
the cycle time. The flowchart and diagram on the following page illustrate these
internal operations for a typical PC.
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
The cycle time of the PC can be automatically calculated and monitored, but it is
necessary to have an understanding of the timing relationships within the PC for
effective System design and programming.
1. Common (or overseeing) processes, such as watchdog timer operation and
2. Data input and output.
3. Instruction execution.
4. Peripheral 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
5