Emerson PACSystems RX3i - Timed Interrupt Performance

PACSystems™ RX3i and RSTi-EP CPU Reference Manual Appendix A
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 220
Worksheet D: Programmer, IOM, I/O Interrupt Sweep Time
The following worksheet can be used to calculate the sweep impact times of programmer
sweep impact, intelligent option modules, and I/O Interrupts. For time data, refer to the
following tables:
Programmer Sweep Impact Times
RX3i I/O Module Sweep Impact Times
Sweep Impact Time of Genius I/O and GBCs
Programmer sweep impact
= ______
IOM—first module (open comm. window)
IOM—per module (polling)
LAN module I/O scan
______
+ ______
+ ______
Total IOM Sweep Impact
= ______
CPU memory access from IOMs
= ______
I/O interrupt sweep impact
I/O interrupt response time
______
+ ______
= ______
Predicted Sweep Time (Other)
______
A-3.12 Timed Interrupt Performance
The sweep impact of a timed interrupt invoking an empty program block or timed
program measures the overall time of fielding the interrupt, starting up the program or
block, exiting the program or block, and restarting the interrupted task. The minimum,
average, and maximum interrupt period reflect the time period from when the first line of
ladder logic is executed in the timed interrupt block.