15 Parameterisation
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If don is lower than doff, the output is switched on once the
measured value is between the switching points (window
function).
If don is higher than doff, the output is switched on once the
measured value exceeds don. The product is switched off only
when the measured value falls below doff (hysteresis function).
If don equals doff, the output is switched on once the measured
value exceeds the switching value don + doff and is switched off
once the measured value falls below the switching value don +
doff again.