PACSystems™ RX3i and RSTi-EP CPU Reference Manual Appendix A
GFK-2222AK October 2019
Appendix A 195
A-2 Instruction Timing
A-2.1 Overview
The tables in this section list the execution and incremental times in microseconds (µs) for
each function supported by the PACSystems CPUs. Two execution times are shown for
each instruction.
Time in µs required to execute the function or function block when power flows into
the function with valid inputs.
Notes:
▪ All times represent typical execution time. Times may vary with input and error
conditions.
▪ Enabled time is for single length units of word-oriented memory.
▪ COMMREQ time was measured between CPU and Ethernet module with
NOWAIT option.
▪ DOIO time was measured using a discrete output module.
▪ Timers are updated each time they are encountered in the logic by the amount of
time consumed by the last sweep.
▪ Performance times for the BUS_ functions were measured on the RX3i using an
RMX128 Redundancy Memory Xchange Module.
▪ Performance times for all redundancy (CRE and CRU) CPUs were measured with
ECC enabled.
▪ Due to a change in caching, measured times for some instructions changed for
release 6.0 as compared to releases 5.0/5.1. It was found that increases in some
instructions were offset by decreases in other instructions, so that no effective net
change was observed.
▪ PLC Version Information
The instruction execution and incremental times were obtained by testing the following
CPU versions:
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