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Configuring hysteresis control via Equation smart rule

The example below shows how to configure filling of retention tank based on measurement of minimum and maximum water level.

Inputs:

  • Reed contact for min level (Variable name: St)
  • Reed contact for max level (Variable name: St1)

Output:

  • Digital output for control of valve or pump (Name: Valve)

Configuring Equation smart rule

Equation smart rule has internal variable called LastState. This variable returns TRUE or FALSE based on last result of evaluation of this smart rule.

Equation

(LastState AND !St1) OR (!LastState AND !St)

Action

If result is TRUE: Valve ... Turn On

If result is FALSE: Valve ... Turn Off

Duration

Minimum duration ... 0:05:00 minutes