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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 ex-
ecute the program and perform other CPU operations is important, as is the timing of each signal coming into and leaving 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.
6-1 Cycle Time 318 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2 Calculating Cycle Time 322 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2-1 PC with I/O Units Only 322 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2-2 PC with Link Units 323 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3 Instruction Execution Times 324 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4 I/O Response Time 333 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4-1 Basic Systems 333 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4-2 Remote I/O Systems 334 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4-3 Host Link Systems 336 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4-4 PC Link Systems 337 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4-5 One-to-one Link I/O Response Time 339 . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4-6 Interrupt Response Times 341 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .