Special Features And Enhancement Options - Siemens LOGO! 24RC Manual

Applications
Block diagram of the LOGO! solution
Float switch for run-
dry protection off
Float switch for run-
dry protection on
Float switch for mains water inlet off

8.7.4 Special Features and Enhancement Options

The function diagram shows how you can connect up the
control system for the pump and the solenoid valve. Its lay-
out corresponds to that of the current flow diagram. You
also have the possibility of incorporating additional func-
tions for specific applications that would only be possible
with the inclusion of extra equipment if you were using con-
ventional technology, e.g.:
Enabling the pump at specific times
Indication of imminent or existing shortage of water
Reporting of system faults
184
Pressure switch
I1
x
T = 20 s
I3
I4
Float switch for
mains water inlet off I3
x
Mains water inlet
I2
LOGO! Manual
A5E00067781 01
Pump
Q1
Q2