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Siemens LOGO Soft Comfort Online Help Manual

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Sample applications
4.4 Fill station
LOGO!Soft Comfort Online Help
212 Operating Instructions, 11/2017
⑥
The parameters for the analog comparator are as follows:
• Sensor: No sensor
• Gain: 1
• Offset: 0
• On Threshold value: 4
• Off Threshold value: 0
The analog comparator switches on the output Q2 if the difference between the flow tempera-
ture and the standardized outdoor temperature exceeds 4 °C.
If the difference falls below 0 °C, the analog comparator switches the output Q2 off again.
⑦
Output Q2 switches the heating on and off.
Mode of operation
The outdoor temperature drops, which causes the value issued to the analog amplifier at
B004 to increase to the same extent. The difference at the analog comparator between the
flow and the outdoor temperature increases accordingly.
If the difference exceeds 4 °C the heating switches on.
By switching on the heating, the flow temperature increases. Because of this, the difference
at the analog comparator between the flow and the outdoor temperature decreases
(provided the outdoor temperature drops more slowly than the flow temperature increases).
If the difference falls below 0 °C, the heating switches off.
Changing parameters
The Offset parameter at the analog amplifier at B004 depends on your desired flow
temperature at 0 °C outdoor temperature. Furthermore, the switch-on threshold and the
switch-off threshold of the heating can change by means of the On and Off threshold values
of the analog comparator at B005.
Try it out!
The example can be found as a circuit program on the LOGO!Soft Comfort DVD-ROM. Load
the circuit program in LOGO!Soft Comfort and try out the instructions above in simulation
mode.
… 212 …


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