PACSystemsâ„¢ RX3i and RSTi-EP CPU Reference Manual Appendix A
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 198
A-3 Overhead Sweep Impact Times
This section contains overhead timing information for the PACSystems CPUs. This
information can be used in conjunction with the estimated logic execution time to
predict sweep times for the CPUs. The information in this section is made up of a base
sweep time plus sweep impact times for each of the CPU models. The predicted sweep
time is computed by adding the sweep impact time(s), the base sweep, and the
estimated logic execution time.
See sample calculation for estimating sweep times at .
The following components make up the total sweep time:
â–ª Programmer communications sweep impact
â–ª I/O Scan and fault sweep impact
â–ª Ethernet Global Data sweep impact
â–ª Intelligent Option Module (LAN modules) sweep impact
â–ª I/O interrupt performance and sweep impact
â–ª Timed interrupt performance and sweep impact
A-3.1 Base Sweep Times
Base sweep time is the time for an empty _MAIN program block to execute, with no
configuration stored and none of the windows active. The following table gives the base
sweep times in microseconds (µs) for each CPU model.
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