318
6-1 Cycle
T
ime
To
aid in PC operation, the average, maximum, and minimum cycle times can be
displayed
on the Programming Console or any other Programming Device and
the maximum cycle time and current cycle time values are held in AR 26 and
AR 27. Understanding the operations that occur during the cycle and the ele-
ments
that af
fect
cycle time is, however
, essential to ef
fective programming and
PC operations.
The
major factors in determining program timing are the
cycle time and the I/O
response time. One run through all required CPU operations is called a cycle;
the time required for each cycle is called the cycle time.
The overall flow of the CPU operation is as shown in the following flowchart.
Cycle Time Section 6-1
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