Pilz PSSnet SHL 8T MRP - Manual (Page 27)

Ring/Network coupling
PSSnet SHL - Redundancy Configuration
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
3.1 Variants of the ring/network cou-
pling
27
Note: The choice of configuration primarily depends on the topological
conditions and the desired level of security
(see table 4) .
One-Switch coupling Two-Switch coupling Two-Switch coupling
with control line
Application The two devices are in
impractical topological
positions.
Therefore, putting a
line between them
would involve a lot of
work for two-Switch
coupling. The two devices are in
practical topological
positions.
Putting down a control
line would involve a lot
of work. The two devices are in
practical topological
positions.
Putting down a control
line would not involve
much work.
Disadvantage If the Switch config-
ured for the redundant
coupling fails, no con-
nection remains
between the networks. Much work involved in
connecting the two
devices to the network
(compared with one-
Switch coupling). Much work involved in
connecting the two
devices to the network
(compared with one-
Switch and two-Switch
coupling).
Advantage Less work involved in
connecting the two
devices to the network
(compared with two-
Switch coupling). If one of the devices
configured for the re-
dundant coupling fails,
there is still a connec-
tion between the net-
works. If one of the devices
configured for the re-
dundant coupling fails,
there is still a connec-
tion between the net-
works.
Table 4: Selection criteria for the variants of the redundant coupling