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3.3.4 Line separator
Operating the point detector on the C-NET:
All C-NET devices are equipped with a line separator.
The C-NET device is equipped with electronic switches which isolate the defective
part in case of a short-circuit on the C-NET detector line. The rest of the detector
line remains serviceable. On a loop line, all C-NET devices remain fully functional
after a single short-circuit.
Operating the point detector OOH740 in collective mode:
In a short-circuit, the point detector disconnects the short-circuit and therefore all
downstream devices and the end-of-line unit.
● A line fault is indicated on the collective control panel. On control panels with a
fault cause display, 'Interrupt' may be displayed instead of 'Short-circuit' as the
reason for the fault.
● The faulty point detector indicates the fault by making the internal alarm
indicator flash. Flashing frequency: Two flashes every 4 s.
Once the cause of a short
circuit has been remedied on the
detector line, an open line separator does not close automatically. Reset the
detector line on the control panel.
3.3.5 Internal alarm indicator in the case of ES <20 (OOH740
and OOHC740)
Information about the product version of your device can be found in the '
version ES [➙ 25]' chapter.
Addressed mode
The point detectors have an internal alarm indicator. The internal alarm indicator
shows the point detector's operating conditions in addressed mode.
Operating condition Flashing mode of alarm indicator
Normal Al off
Alarm AI flashes every second
Test mode Al off
Alarm in test mode AI flashes every second
The flashing behavior of the point detectors in addressed mode for higher product
versions is described in the 'Advanced flashing behavior of the alarm indicators in
the case of ES ≥20 (OOH740 and OOHC740) [➙ 40]' chapter.
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