Rockwell Automation T3831 ICS Regent Communications Package for Winterpret - Manual (Page 27)

Communications Package for W INTERPRET (T3831)
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Table 7. Example of GPL Data Configuration.
Type of
Variable
Regent
1
Regent
2
Regent
3
Regent
4
Totals
Bit Data 50 100 60 320 530
Word Data 10 42 15 65 132
FP Data 0 0 10 20 30
Applying the above equation to this configuration yields a
total GPL data size of 914 bytes. Using this total GPL data
size in the graph in Figure 12, indicates that the approximate
GPL cycle time would be 1.05 seconds. This would be the rate
at which each Regent will receive fresh data from every other
Regent on the GPL network.
When multiple network legs are configured each leg runs
asynchronously. Each leg will be updating the GPL data at
this rate. Because of the asynchronous operation of the
network legs, the data in each Regent will be updated at a rate
less than or equal to the cycle time.
Application Program Scan Time
After the GPL configuration is loaded (Load Network
command) and the GPL communications is active (Connect
Network command) the Regent performs additional processing
functions each application program scan. This includes
refreshing the Primary Output Buffer and checking the Input
Buffers and processing any input data received from other
Regents. This causes the Regent’s application program scan
time to get longer than it was before the GPL network was
activated.
The amount of increase in application program scan time is
mostly affected by the total amount of GPL data configured
for the network. This is illustrated in Figure 13. The amount
of GPL data is calculated the using the equation shown on
page 26. This value can be used to estimate the amount that
GPL communications increases the Regent’s application
program scan time.