FL MGUARD GT/GT
105656_en_05 PHOENIX CONTACT 175
8.3.3 Connecting service contacts
Signal contact
The signal contact monitors the FL MGUARD GT/GT and thus enables remote diagnostics.
Interruption of the contact via the floating signal contact (relay contact, closed current cir-
cuit) indicates the following:
– Failure of at least one of the two supply voltages.
– Power supply of the FL MGUARD GT/GT below the specified limit value (supply volt-
age 1 and/or 2 is less than 18 V).
– The faulty link status of at least one port. The link status message for each port can be
masked on the FL MGUARD GT/GT via the management software.
By default upon delivery, there is no connection monitoring.
– Error during selftest.
During a restart, the signal contact is interrupted until the device has started up completely.
This also applies when the signal contact is manually set to “Closed” in the software config-
uration.
The switch has a floating signal contact. An error is indicated when the contact is opened.
Figure 8-5 Basic circuit diagram for the signal contact
Removing the SFP modules
• Remove the fiber optic plug before removing the SFP
module.
• Turn the release latch (A) down and pull out the SFP
module (B).
WARNING: Only SELV circuits with voltage limitations according to EN 60950-1 may be
connected to the signal contact.
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