Installation MRD TNM4000
Release 02 12/2020
Industrial Switch >TNM4000
17
1.5
Alarm relay contact
Each TNM4000-TP36FF4X16G24P device is equipped with 1 alarm relay contact.
The alarm relay contact is a potential-free relay contact.
The potential-free relay contact reports through a break in contact:
The failure of at least one supply voltage.
The device is not operational.
When the device is normally working, the normally-open contact is closed and the
normally-closed contact is open. When alarm occurs, the normally-open contact is
open and the normally-closed contact is closed.
Note:
You can use the alarm relay contact functions when the voltage supply is
connected. If there is redundant voltage supply, but this is turned off, there is a
contact interruption at the corresponding alarm relay contact.
Figure 3: relay contact
Item
Name
Function
1
Normally Close Contact
Open when the device is working normally.
Closed when alarm occurs.
2
Double-throw Contact
Two-way Contact.
3
Normally Open Contact
Closed when the device is working normally.
Open when alarm occurs.
Table 2: Description of Relay
