Diagnosis Levels - Siemens OOH740 Technical Manual

3.3.3 Diagnosis levels

Building Technologies
Fire Safety
Operating the point detector on the C-NET:
The point detector monitors its operation largely autonomously. The signals of all
sensors are permanently monitored.
The following components in particular should be monitored for correct
functionality:
● Temperature sensors
● Light emitters
● Light receivers
The following diagnosis levels are derived from the different control measurements:
● Normal
● Observe information
● Replacement recommended
● Replacement necessary
● Fault
When an error occurs which impairs the correct functionality of the device, a fault
message is reported to the control panel.
The CO sensor can only be monitored for failure. For a functional test, the CO
sensor must be tested with test gas.
Operating the point detector OOH740 in collective mode:
When an error occurs which impairs the correct functionality of the device, a fault
message is reported to the control panel.
● All of the devices installed downstream of the faulty point detector and the end-
of-line unit are automatically disconnected.
● A line fault is indicated on the collective control panel.
● The faulty point detector indicates the fault by making the internal alarm
indicator flash. Flashing frequency: Two flashes every 4 s.
Structure and function
Function
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