Electronic Version 3-Wire Dc-Pnp - Endress+Hauser Liquiphant FTL31 Manual

Liquiphant FTL31
Electronic version 3-wire DC-
PNP
Endress+Hauser
3-wire DC-PNP is preferably used in conjunction with programmable logic controllers (PLC), DI
modules as per EN 61131-2. Positive signal at the switch output of the electronics (PNP).
Voltage source: non-hazardous contact voltage or Class 2 circuit (North America).
M12 connector
Depending on the analysis of the switch outputs, the device works in the MAX (maximum safety) or
MIN (minimum safety) mode.
A cable is optionally available for order, see "Accessories" section (→  27).
Electrical connection
M12 connector
A0022901
Yellow LED (ye) not lit
Yellow LED (ye) lit
K external load
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
0.5A
L– L+
A0022917
LED lit
LED not lit
Fault or warning
K1 / K2 external load
Operating mode
MAX
1
2
3
4
K
0.5A
L– L+
1 2
1 2
Sensor covered
Sensor exposed
Fault
MIN
2 1
4
3
0.5A
K
L+
L–
A0022858
1 4
1 4
A0021416
Yellow LED
(ye)
1 2
1 4
A0023016
1 2
1 4
A0023029
1 2
1 4
A0023030
A0022859
A0021417
Red LED
(rd)
7