PACSystems™ RX3i and RSTi-EP CPU Reference Manual Appendix A
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 213
– Exchange Period n
th
Exchange, as configured in ms (Production Period for
production exchanges and Consumption timeout for consumption exchanges
– n
th
Exchange configured (value=1) or not configured (value=0)
It is recommended that the calculated for a given EGD
exchange configuration and Watchdog period should be less than 50-55% for stable
operation within watchdog period without WDT elapse.
Note: The higher percentage of this parameter indicates that the EGD on Embedded
Ethernet interface could have a greater impact on CPU applications.
A-3.7 Example Calculation for EGD Utilization on RX3i
CPE302/CPE305/CPE310 and RSTi-EP CPE100/CPE115
The watchdog time configured to 200ms for calculations in the table below:
A-3.8 Normal Sweep – EGD on RX3i CPE302/CPE305/CPE310 and
RSTi-EP CPE100/CPE115 Embedded Ethernet Interface
The following table shows the chart for setting up EGD exchanges on Embedded Ethernet
for RX3i CPE302/CPE305/CPE310 with a no sweep load and no network traffic. The table
is a compilation of results based on testing with two RX3i CPE310 Systems in which one is
acting as the EGD Producer and the other is acting as the EGD Consumer.
SN EGD Exchange Type of Exchange Period Total_EgdImpactPerWDT_ms[n]
1 EGD Exchange#1 Producer 25 1.600
2 EGD Exchange#2 Producer 25 1.600
3 EGD Exchange#3 Producer 30 1.333
4 EGD Exchange#4 Producer 30 1.333
5 EGD Exchange#5 Consumer 30 1.333
6 EGD Exchange#6 Consumer 50 0.800
7 EGD Exchange#7 Consumer 50 0.800
8 EGD Exchange#8 Consumer 50 0.800
9.600
4.800
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