Pilz PSSnet SHL 8T MRP - Manual (Page 110)

Network load control
PSSnet SHL - Basic Configuration
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
8.2 Multicast application
111
IGMP Querier
“IGMP Querier active” allows you to enable/disable the Query function.
The Protocol selection fields allow you to select IGMP version 1, 2 or 3.
In “Send interval” you specify the interval at which the device sends
query packets (valid entries: 2-3599 s, default setting: 125 s).
Note the connection between the parameters Max. Response Time,
Send Interval and Group Membership Interval
(see on page 112 „Pa-
rameter values“) .
All IGMP-capable terminal devices respond to a query with a report
message, thus generating a network load.
Select large sending intervals if you want to reduce the load on your net-
work and can accept the resulting longer switching times.
Select small sending intervals if you require short switching times and
can accept the resulting network load.
Current querier IP address
“Current querier IP address” shows you the IP address of the router that
has the query function.
In “Max. Response Time” you specify the period within which the Multi-
cast group members respond to a query (valid values: 1-3598 s, default
setting: 10 s).
Note the connection between the parameters Max. Response Time,
Send Interval and Group Membership Interval
(see on page 112 „Pa-
rameter values“) .
The Multicast group members select a random value within the re-
sponse time for their response, to prevent all the Multicast group mem-
bers responding to the query at the same time.
Select a large value if you want to reduce the load on your network and
can accept the resulting longer switching times.
Select a small value if you require short switching times and can accept
the resulting network load.
Group Membership Interval
In “Group Membership Interval” you specify the period for which a dy-
namic Multicast group remains entered in the device if it does not re-
ceive any report messages (valid values: 3-3600 s, default setting: 260
s).
Note the connection between the parameters Max. Response Time,
Send Interval and Group Membership Interval
(see on page 112 „Pa-
rameter values“) .