Endress+Hauser Liquiphant FTL33 Bedienungsanleitung Seite 56

Electrical connection
Function monitoring with M12 connector
Using a two-channel analysis, function monitoring of the sensor can be implemented in
addition to level monitoring, e.g. per relay switch, PLC, AS-i Bus I/O module, ...).
When both outputs are connected, the MIN and MAX outputs assume opposite states when
the device is operating fault-free (XOR). In the event of an alarm condition or a line break,
both outputs are deenergized.
Connection for function monitoring with antivalence
2 1
3
4
K1 K2
L–
LED lit
LED not lit
Fault or warning
K1 / K2 external load
56
Sensor covered
Sensor exposed
0.5A
L+
Fault
A0022917
Yellow LED
(ye)
1 2
1 4
A0023016
1 2
1 4
A0023029
1 2
1 4
A0023030
Liquiphant FTL33
Red LED (rd)
Endress+Hauser