Controller parameters |
Portrayed in LOGO! |
Possible value range in the LOGO! |
Mn |
Output of the PI controller block |
0 to 1,000 |
kP
kI |
In the LOGO!, the parameter KC applies as an increase for the I part and the P part of the controller equally. Should you enter KC=0, then the P part of the controller switches off. In this special case, k is automatically set to 1 for the I part. If KC <> 0: kP = kI = KC |
0.00 to 99.99 |
TS Sampling time, duration of a time slice |
Fixed |
500 ms |
TI |
Parameter TI, if you set this parameter to 99:59 min, then you switch off the I part of the controller. |
00:01 min to 99.59 min |
en |
Refer to SP and PV |
" |
SP |
The parameter SP is the set-value assignment w. For this parameter you can use the analog output of a different special function. |
-10,000 to +20,000 |
PV |
PV is the process value x and is calculated as follows: PV = (analog value on input * gain) + offset. You can connect the input for example by means of an analog input with a PT100 sensor. |
" |
|
The gain parameter has an effect on PV |
0.0 to 10.0 |
|
The offset parameter has an effect on PV |
-10,000 to +20,000 |
|
PV is restricted by the parameters Min. and Max. |
In each case: |
|
The Dir parameter gives the action direction of the controller. Positive means: If set value > process value then the process value is increased; if set value < process value then the process value is reduced. Negative means: If set value > process value then the process value is reduced; if set value < process value then the process value is increased. e.g. heat regulation: if the set value is greater than the process value (room is too cold), the manipulated variable increases the process value. |
- or + |
Refer to the PI controllers - description of special function for more details (for example, switching from manual to automatic mode, parameter sets, etc.).