Siemens v1.0 Service Manual Page 147

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Example "PID control"
4.5 Configure PID controller
STEP 7 Basic V10.5
Getting Started, 12/2009, A5E02651459-01
147
4.5 Configure PID controller
Introduction
The following steps show you how to use the technological object "PID_Compact" to
configure the PID controller.
Settings for configuring the PID controller
Controller type
The controller type is used to define a pre-selection for the unit of the value to be
controlled. In this example, "Temperature" with the unit "°C" is used as the controller type.
Input/output parameters
In this area you supply the input and output parameters for setpoint, actual value and the
controlled variable of the technological object "PID_Compact". To use the PID controller
without additional hardware, link the input and output parameters of "PID_Compact" to
the "output_value" and "temperature" tags interconnected to the simulation block
"PROC_C":
The actual value is simulated by "PROC_C" and used as input of "PID_Compact".
In the example the actual value corresponds to the measured temperature in the
heating chamber, which is mapped in the "temperature" tag.
The controlled variable by calculated by the technological object "PID_Compact" and
is the output parameter of the block. The controlled variable is mapped in the
"output_value" tag and is used as input value of "PROC_C".
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