Egd Sweep Impact For Embedded Ethernet Interface On Rx3I & Rsti-Ep Cpe Models - GE PACSystems RX7i Reference Manual

Appendix A. Performance Data
A-3.6 EGD Sweep Impact for Embedded Ethernet Interface on RX3i &
RSTi-EP CPE Models
EGD Sweep Impact for RX3i CPE330 and CPE400
The CPE330 and CPE400 process Ethernet communications independently from logic and sweep
execution. This architecture precludes the possibility of Ethernet communications causing the watchdog
timer to time out. Consequently, the discussion below does not apply to CPE330 or CPE400.
EGD Sweep Impact for RX3i CPE302/CPE305/CPE310 and RSTi-EP CPE100/CPE115
Embedded Ethernet Interface
Each EGD production or consumption will take about 200 µs regardless of size of exchange. For Produced
Exchanges on the embedded port you can think of it as a timed interrupt block that takes 200µs duration
to execute each time it is triggered. For Consumed Exchanges on the embedded port you can think of it
as an I/O interrupt block that takes 200µs duration to execute each time the remote unit sends an
exchange and it is received on the embedded port.
It is important to note that this 200µs per exchange is not a simple 'sweep impact' time, rather per
execution of that exchange time, and depending on sweep time length and production period it may
occur more than one time per sweep.
Users configuring systems with EGD on an embedded Ethernet port should take care to make sure that
production and consumption time on the embedded Ethernet port is accounted for.
The impact of EGD Exchanges configured on Embedded Ethernet Interface of RX3i CPE302/CPE305
/CPE310 and RSTi-EP CPE100/CPE115 on the Controller sweep can be reflected in two parameters:
1. ����������_������������������������������_����
configured in milliseconds (ms).
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2.
The formula for calculating these two parameters are shown below:
����������_������������������������������_���� = ∑ (
����������������������������������������������_% = (
������_����
Watchdog time configured in ms
–
������������_����
Exchange Period n
–
��
exchanges and Consumption timeout for consumption exchanges
������ℎ����������������������
n
–
��
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.
290
:
This is the percentage EGD processor utilization.
:
255
������������_����
��=1
����������_������������������������������_����
th
Exchange, as configured in ms (Production Period for production
th
Exchange configured (value=1) or not configured (value=0)
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
This is the total EGD impact per Watchdog Time period
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× ������ℎ����������������������
��
������_����
× 0.2 00)
��
) × 100
GFK-2222AD