Siemens SIMATIC ET 200S Operating Instructions Manual page 346

2PULSE
5.7 Application Examples
Monitoring and setting the control
With a variable table, you can monitor or set all the important parameters of the control. If,
for example, you change the DB1.SP_INT setpoint, you see how the measured value of the
current in DB1.PV responds. Note that certain values of the DB 1 are already assigned when
called in OB 100.
The following table shows an example of a variable table.
Address
DB1.SP_INT
DB1.PV
DB1.GAIN
DB1.TI
Additional optimization possibilities
● Depending on the concrete implementation, the master control behavior of the current
● Depending on the application, manual operation or controlled starting and stopping of the
● The data transfer at the fieldbus causes dead times. In isochronous mode, you can
Wiring / Terminal Assignment Diagram
Figure 5-34
346
Display format
FLOATING POINT
FLOATING POINT
FLOATING POINT
FLOATING POINT
regulator can be improved by a precontrol. In the simplest case the setpoint of the current
multiplied by a constant factor can be added to the controller output.
control is required. The corresponding integrated functions of the FB 41 can be used to
this purpose.
achieve a state in which these dead times are constant. This makes a more aggressive
setting of the controller parameters possible, thus improving the control quality.
24 VDC
Terminal assignment of the 2PULSE for the current regulation of a valve
Description
Setpoint of the current (0.0 to 100.0)
Controller-internal representation of the measured
value of the current (0.0 to 100.0)
Proportional gain of the controller
Integration time of the controller
24 VDC
Operating Instructions, 06/2010, A5E00124867-07
Technological Functions