266
ifm
System Manual
ecomat
mobile
SmartController (CR2500, CR2502) V05
Controller functions in the ecomatmobile controller
Functions for controllers
11.3.4
Function PID2
Contained in the library:
ifm_CRnnnn_Vxxyyzz.LIB
Available for the following devices:
•
CabinetController: CR0301, CR0302, CR0303
•
ClassicController: CR0020, CR0032, CR0505
•
ExtendedController: CR0200, CR0232
•
PCB controller: CS0015
•
SafetyController: CR7020, CR7021, CR7032, CR7200, CR7201, CR7232, CR7505, CR7506
•
SmartController: CR2500, CR2501, CR2502
Function symbol:
PID2
X
Y
XS
XMAX
KP
KI
TN
KD
TV
RESET
Description
PID2 handles a PID controller with self optimisation.
The change of the manipulated variable of a PID controller has a
p
roportional,
i
ntegral and
d
ifferential
component. The manipulated variable changes first by an amount which depends on the rate of
change of the input value (D component). After the end of the derivative action time TV the
manipulated variable returns to the value corresponding to the proportional component and changes in
accordance with the reset time TN.
The values entered at the function inputs KP and KD are internally divided by 10. So, a finer grading
can be obtained (e.g.: KP = 17, which corresponds to 1.7).
NOTE
The manipulated variable Y is already standardised to the PWM function (RELOAD value = 65,535).
Note the reverse logic:
65,535 = minimum value
0 = maximum value.
Note that the input value KD depends on the cycle time. To obtain stable, repeatable control
characteristics, the function should be called in a time-controlled manner.
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