Appendix A. Performance Data
GFK-2222AD
April 2018
277
The following diagram shows the differences between the full sweep phases and the base sweep phases.
Base Sweep vs. Full Sweep Phases
Base Sweep
Full Sweep
<START OF SWEEP>
Sweep Housekeeping
NULL Input Scan
98
Program Logic Execution
NULL Output Scan
<END OF SWEEP>
<START OF SWEEP>
Sweep Housekeeping
Input Scan
EGD Consumption Scan
Program Logic Execution
Output Scan
EGD Production Scans
99
Poll for Missing I/O Modules
100
Controller Communications Window
Backplane Communications Window
<END OF SWEEP>
For the base sweep, if there is no configuration, the input and output scan phases of the sweep are NULL
(i.e., check for configuration and then end). The presence of a configuration with no I/O modules or
intelligent I/O modules (GBC) has the same effect. The logic execution time is not zero in the base sweep.
The time to execute the empty _MAIN program is included so that you only need to add the estimated
execution times of the functions actually programmed. The base sweep also assumes no missing I/O
modules. The lack of programmer attachment means that the Controller Communications Window is
never opened. The lack of intelligent option modules means that the Backplane Communications
Window is never opened.
98
If I/O is suspended, the input and output scans are skipped.
99
If no Ethernet Global Data (EGD) exchanges are configured, the consumption and production scans are skipped.
100
Polling for missing I/O modules only occurs if a
Loss of ...
fault has been logged for an I/O module.
