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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 9 | System Configuration en | 407
50 Diagnose installation
50.1 Introduction
With the Installation page in the Diagnose section of the
web interface (see figure 50.1), the system installation
can be diagnosed.
50.2 Cable length margin
The cable length margin can be checked if the network
controller has hardware version 20.00 or higher. As is
indicated in section 31.5, the maximum cable length
depends mainly on the number of nodes in the system.
For a system loop a certain maximum data delay is
permitted for proper operation. Most of the delay is the
propagation delay of the cable, but each node
introduces some additional delay that depends
somewhat on the temperature of the unit. A higher unit
temperature causes more delay and reduces the
maximum cable length. The network controller
measures the data delay and calculates the remaining
time. This time margin is then converted to the Cable
length margin, the length of cable that can be added to
the system. Due to the temperature dependance this
margin will change with temperature, dependent on the
number of nodes in the system. Therefore an additional
quality indication is given: Safe, Critical or Unstable.
Safe means no action required, there is sufficient
margin. In a Critical situation the margin should be
checked at the highest expected temperature to make
sure that there is still a margin left. In an Unstable
situation, the system size should be reduced by
decreasing the number of nodes or the length of the
cable.
When a redundant loop topology is used, the cable
length should be checked with the shortest link between
two nodes removed. This is the worst case situation.
50.3 Number of nodes
The number of connected addressable nodes can be
checked if the network controller has hardware version
20.00 or higher. See table 31.2 for the number of nodes
per unit. The maximum number of nodes is 63.
50.4 Optical network
Proceed as follows to diagnose the optical network:
1 Check the optical power margin of all network
connections by reducing the optical level to Half
power.
2 Check for fault events with reduced level. If no
relevant faults are present, then resume normal
operation by restarting the network controller.
Otherwise, check for critical connections.
figure 50.1: Installation page
Note
Although it is possible to resume normal
operation by selecting Full power, it is strongly
recommended to restart the network controller.
In case the power margin is nearly critical, the
unit may not accept the Full power command
anymore.