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GFK-0467K A-1
Instruction Timing
The Series 90-30, 90-20, and Micro PLCs support many different functions and function blocks.
This appendix contains tables showing the memory size in bytes and the execution time in
microseconds for each function. Memory size is the number of bytes required by the function in a
ladder diagram application program.
Two execution times are shown for each function:
Execution Time Description
Enabled Time required to execute the function or function block when power
flows into and out of the function. Typically, best-case times are
when the data used by the block is contained in user RAM (word-
oriented memory) and not in the ISCP cache memory (discrete memory).
Disabled Time required to execute the function when power flows into the
function or function block; however, it is in an inactive state, as
when a timer is held in the reset state.
Note
Timers and counters are updated each time they are encountered in the logic,
timers by the amount of time consumed by the last sweep and counters by one
count.
A
Appendix