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Electrical connection
16
Q2
Pin 1 Supply voltage +
Pin 2 2nd switch output
Pin 3 Supply voltage -
Pin 4 IO-Link communication or 1st switch output (SIO mode)
6.3.1
SIO mode (without IO-Link communication)
Minimum safety
Terminal assignment
2 1
3 4
–
+
Maximum safety
Terminal assignment
2 1
3 4
–
Function monitoring
When both outputs are connected, the MIN and MAX outputs assume opposite states
(XOR) when the device is operating fault-free. In the event of an alarm condition or a cable
break, both outputs are de-energized. This means that function monitoring is possible in
addition to level monitoring. The behavior of the switch outputs can be configured via IO-
Link.
Connection for function monitoring using XOR operation
Terminal assignment
2 1
3 4
–
+
L+
2
1
C/Q1
3
4
L–
R1
+
LED yel-
MAX output
low (ye)
2
ye2
+
2
Liquipoint FTW33
IO-Link
SIO
MIN output
LED yellow (ye) 1
+
4
+
4
MAX output
LED yellow (ye) 2
ye2
+
2
+
2
LED yel-
MIN output
low (ye)
1
ye1
+
4
Endress+Hauser
A0037916
ye1
LED red
(rd)
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