Configure Controller Difference Cont_S; Configuring Control Algorithm Cont_S - Siemens SIMATIC S7-1200 Function Manual

Using PID basic functions
7.2 CONT_S
7.2.2

Configure controller difference CONT_S

Use process value periphery
To use the process value in the periphery format at the PV_PER input parameter, follow
these steps:
1. Select the "Enable I/O" check box.
2. If the process value is available as a physical quantity, enter the factor and offset for the
scaling in percent.
The process value is then determined according to the following formula:
PV = PV_PER × PV_FAC + PV_OFF
Use internal process values
To use the process value in the floating-point format at the PV_IN input parameter, follow
these steps:
1. Clear the "Enable I/O" check box.
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 CONT_S (Page 456)
7.2.3

Configuring control algorithm CONT_S

PID algorithm
1. Enter the "proportional amplification" for the P-component.
2. Enter the integration time for the time behavior of the I-component.
With an integration time of 0.0, the I-component is switched off.
See also
Mode of operation CONT_S (Page 456)
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Function Manual, 03/2017, A5E35300227-AC
PID control