Siemens SIMATIC S7-1200

Using PID basic functions
7.3 TCONT_CP
PID control
Function Manual, 03/2017, A5E35300227-AC
217
7.3.2
Configure TCONT_CP
7.3.2.1
Controller difference
Use process value periphery
To use the input parameter PV_PER, proceed as follows:
1. Select the entry "Periphery" from the "Source" list.
2. Select the "sensor type".
Depending on the sensor type, the process value is scaled according to different
formulas.
– Standard
Thermoelements; PT100/NI100
PV = 0.1 × PV_PER × PV_FAC + PV_OFFS
– Cooling;
PT100/NI100
PV = 0.01 × PV_PER × PV_FAC + PV_OFFS
– Current/voltage
PV = 100/27648 × PV_PER × PV_FAC + PV_OFFS
3. Enter the factor and offset for the scaling of the process value periphery.
Use internal process values
To use the input parameter PV_IN, proceed as follows:
1. Select the entry "Internal" from the "Source" list.
Control deviation
Set a deadband range under the following requirement:
● The process value signal is noisy.
● The controller gain is high.
● The derivative action is activated.
The noise component of the process value causes strong deviations of the manipulated
variable in this case. The deadband suppresses the noise component in the steady controller
state. The deadband range specifies the size of the deadband. With a deadband range of
0.0, the deadband is turned off.
See also
Mode of operation TCONT_CP (Page 472)