6. Function blocks
6.1 Manufacturer function blocks
Level control
The contents of a liquid tank must not fall below or exceed a specific liquid level.
The ACTUAL value (level) is higher than the SETPOINT, meaning that liquid needs to
be drained. Function block output Q1 switches the drain valve on.
The ACTUAL value (level) is lower than the SETPOINT, meaning that liquid needs to
be replenished. Function block output Q2 switches the supply valve on.
Hysteresis values H1 and H2 define how long liquid needs to be drained or replen-
ished. This also means that they define the volume before draining and after replen-
ishing.
See also
→ Section "FT - PT1-Signal smoothing filter ", page 381
→ Section "VC - Value limitation ", page 406
→ Section "BC - Block comparison", page 410
→ Section "BV - Boolean operation", page 470
→ Section "PO - Pulse output", page 386
easyE402/24 MN050009ENEaton.com
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