Using PID basic functions
7.3 TCONT_CP
PID control
Function Manual, 03/2017, A5E35300227-AC
219
Set P-controller with operating point
1. Set a PD-controller with an operating point.
2. Enter the derivative action time 0.0.
The derivative action is disabled.
The control zone limits the value range of the control deviation. If the control deviation is
outside of this value range, the manipulated value limits are used.
With an occurrence in the control zone, the derivative action leads to a very quick reduction
of the manipulated variable. Thus, the control zone only makes sense for switched on
derivative actions. Without control zone, only the reducing proportional action would reduce
the manipulated value. The control zone leads to a quick oscillation without over/under
shooting if the emitted minimum or maximum manipulated values are removed from the
manipulated value required for the new operating point.
1. Activate the "Activate" check box in the "control zone" group.
2. Enter a setpoint value in the "Width" input field from which the process value may deviate
above or below.
Mode of operation TCONT_CP (Page 472)
Manipulated value continual controller
Manipulated value limits
The manipulated value is limited at the top and bottom so that it can only accept valid values.
You cannot turn off the limitation. Exceeding the limits is displayed through the output
parameters QLMN_HLM and QLMN_LLM.
1. Enter a value for the high and low manipulated value limits.
The manipulated value can be scaled for output as a floating point and periphery value
through a factor and an offset according to the following formula.
Scaled manipulated value = manipulated value x factor + offset
Default is a factor of 1.0 and an offset of 0.0.
1. Enter a value for the factor and offset.
The pulse generator must be turned on for a continual controller.
1. Disable the "Activate" option check box in the "Pulse generator" group.
Mode of operation TCONT_CP (Page 472)
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