Rockwell Automation T3831 ICS Regent Communications Package for Winterpret - Manual (Page 25)

Communications Package for W INTERPRET (T3831)
P D - 6 0 4 1 M a r c h , 0 6
25
In a GPL network with one leg, stopping the Net Master stops
all GPL communications activities.
In a GPL network with two or more redundant legs, stopping
one Net Master only stops the GPL communications for a
single network leg. The other network legs should remain
operational because they are managed by a different Regent
node. The Regent that has been stopped only stops
performing the Net Master polling for its associated network
leg. However, if it is still connected (see Connect Network,
above) it will continue to respond to GPL communications
polling from other Net Masters on the other network legs.
GPL Performance
There are two performance characteristics related to Regent
systems that perform GPL communications; the GPL cycle
time and the application program scan time. Each of these
are discussed below.
GPL Cycle Time
GPL cycle time represents the time required for all Regents to
take their turn transmitting their data on a leg of the GPL
network (in response to the poll commands issued by the
associated GPL Net Master). In most applications the GPL
cycle time is a function of the total amount of GPL data that is
configured for the GPL network. As the total amount of data
increases, so does the GPL cycle time. This is illustrated in
Figure 12.