The PID-Controller generates a signal depending on the deviation of the controlled variable from the reference variable.
The user can enable the integral parts of the two PI controllers setting the input “In Integral En.” manually in the property sheet or via a digital input in the wire-sheet. Therefore he has to set the “Summary” flag of this input in the Slot sheet.
This additional input “In Integral En.” can be used to enable PIDPlus to act as a P controller during plant start‑up and then switch on an Integral component after start‑up is complete.
Fig. 143. Wire-sheet Icon
Fig. 144. Property Sheet
Fig. 145. Slot Sheet
Table 103. Inputs
Inputs |
Type |
Functional description |
In X |
numeric |
Master-controlled variable |
In W |
numeric |
Reference variable, also known as setpoint |
In Integral En. |
boolean |
Enables and disables integral control action. When “In Integral En.” is zero, integral action in the master and cascade controllers is disabled and the integral sum is reset |
In Enabled |
boolean |
If the input “In Enabled” is set to false disabled in the slot sheet, the output “Out” will be disabled and is set to the value “0”. |
By default the input “In Integral En.” is accessible on the Property sheet where it can be set manually to true or false.
If a user wants to dynamically change the integral part, he can reconfigure this input in the Slot Sheet checking the “Summary flag.
One digital input “In Integral En.” that enables and disables integral control action. When “In Integral En.” is zero, integral action in the master and cascade controllers is disabled and the associated integral sum is reset.
If the input “In Enabled” is set to false disabled in the slot sheet, the output “Out” will be disabled and is set to the value “0”.
Table 104. Outputs
Outputs |
Type |
Functional description |
Out |
numeric |
Control output |
Table 105. Parameter List
Description |
Value Range |
Default Value |
Unit |
P1 Proportional band Do not set this parameter to 0. |
0...∞ |
4 |
K |
P2 Integral action time If this parameter is set to 0, the integral control is disabled |
0...∞ |
300 |
S |
P3 Differential action time If this parameter is set to 0, the differential control is disabled |
0...∞ |
10 |
S |
P4 Upper Limit must be higher than P5 |
0…100 |
100 |
% |
P5 Lower limit must be lower than P4 |
0…100 |
100 |
% |