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SECTION 6
Program Execution Timing
The timing of various operations must be considered both when writing and debugging a program. The time required to
execute the program and perform other CPU operations is important, as is the timing of each signal coming into and leav-
ing the PC in order to achieve the desired control action at the right time. This section explains the cycle and shows how
to calculate the cycle time and I/O response times.
I/O response times in Link Systems are described in the individual System Manuals. These are listed at the end of
Section
1 Introduction
.
6-1
Cycle Time
228
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2
Calculating Cycle Time
232
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2-1
I/O Units Only
232
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2-2
PC with Link Units
233
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3
Instruction Execution Times
235
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4
I/O Response Time
241
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .