GR-750x series
Control panel for addressable emergency
luminaires
Document number: 923750400_09_007
Date: 3/5/2022
Page: 23 of 71
[23]
Figure 12
3.4.1 Panel network fault examples
Figure 13
Case 1 (Figure 13):
In this case we have 4 panels connected as shown above, using a closed ring topology.
If panel
P2
stopsoperating (goes to cut off, unexpected crash or some other fault) then
P1
,
P3
and
P4
panels
will continue to communicate with each other. The
P4
will become the connecting node between the
P1
and
P3
.
P1
and
P3
are physically connected because the
P2
does not operate, and it is bypassed by the panel
network safety hardware. In this case the cumulative cable length between
P1
and
P3
is 1000m
(500m+500m) and it exceeds the nominal cable length of 800m.
The panel network communication from
this side of the ring cannot be reliable.
In any case, the communication between
P1
and
P3
will not be
interrupted because there is
P4
that is connected to them and in turn connecting them together.
Figure 14
Case 2 (Figure 14):
In this case we have 4 panels connected as shown above, using an open ring topology. If
panel
P2
stops operating (goes to cut off, unexpected crash or some other fault) then
P3
and
P4
panels will
continue to communicate with each other.
P1
and
P3
are physically connected because the
P2
does not
operate, and it is bypassed by the panel network safety hardware. In this case the cumulative cable length
between
P1
and
P3
is 1000m (500m+500m) and it exceeds the nominal cable length of 800m.
The panel
network communication from this side of the ring cannot be reliable.
The communication between
P1
and
P3
cannot be guaranteed. The resulting sub network (
P3
&
P4
) will continue normal operation and the user
will be notified for the relative faults. After the problem with
P2
is resolved, the panel network will return to its
initial state.