PI-Controller

Proportional Integral Controller
The I share is responsible for an exact adjustment to this value.

Inputs↑

Abbreviation	Summary	Description	Value Range
PV	Process value	Actual value of the controlled variable.	∞
Auto	Automatic	0 = Manual 1 = Automatic	0/1
Off	Off / Lock	Pulse (< 200 ms): Outputs are reset / switched off. Pulse (> 200 ms): Block is locked. Dominating input.	0/1

Abbreviation	Summary	Description	Value Range
CO	Controller output	Output of the controller for manipulating the controlled variable.	∞

Abbreviation	Summary	Description	Unit	Value Range	Default Value
Rem	Remanence input	Remanence input: If active, the function block retains its previous state after a Miniserver reboot. The state of the function block is saved: – When saving to the Miniserver – At a planned reboot – Before a backup – Once per hour The data is saved on the SD card.	-	0/1	0
SP	Setpoint	Setpoint of the controlled variable.	-	∞	5
St	Sampling time	At this interval, the controller calculates new values for (CO).	s	0...∞	1
Th	Threshold	Used to suppress small control differences between (PV) and (SP). If the difference is less than the threshold, no new value is calculated for (CO). This helps avoid any unnecessary load on the actuator.	-	∞	1
Kp	Proportional gain		-	∞	2
Ki	Integral gain		-	∞	1
Mv	Manual value	When (Auto) is 0, this value is output at (CO).	-	∞	5
Min	Minimum	Specifies the minimum output value for (CO).	-	∞	0
Max	Maximum	Specifies the maximum output value for (CO).	-	∞	10

CO = Kp * (Target - Input) + Ki * (Sum of errors) * Sample Time

Legend:

CO: Controller Output

Kp: Proportional gain

Target: Setpoint

Input: Actual (measured) value

Ki: Integral gain

Sum of errors: Accumulated past errors

Sample Time: Time interval between calculations