Performing Pretuning; Performing Fine Tuning - Siemens SIMATIC S7-1200 Function Manual

Using PID basic functions
7.3 TCONT_CP
7.3.3.7

Performing pretuning

Requirements
● The instruction and the technology object are loaded on the CPU.
Procedure
To manually determine the optimum PID parameters for initial commissioning, follow these
steps:
1. Click the "Start" icon.
If there is no online connection, this will be established. The current values for the
setpoint, process value and output value are recorded.
2. Select "Pretuning" from the "Mode" drop-down list.
TCONT_CP is ready for tuning.
3. In the "Output value jump" field, specify how much the output value should be increased.
4. Enter a setpoint in the "Setpoint" field. The output value jump only takes effect when
another setpoint is entered.
5. Click the
The pretuning starts. The status of the tuning is displayed.
7.3.3.8

Performing fine tuning

Requirements
● The instruction and the technology object are loaded on the CPU.
Procedure
To determine the optimal PID parameters at the operating point, follow these steps:
1. Click the "Start" icon.
If there is no online connection, this will be established. The current values for the
setpoint, process value and output value are recorded.
2. Select "Fine tuning" from the "Mode" drop-down list.
TCONT_CP is ready for tuning.
3. In the "Output value jump" field, specify how much the output value should be increased.
4. Click the
Fine tuning starts. The status of the tuning is displayed.
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"Start tuning" icon.
"Start tuning" icon.
Function Manual, 03/2017, A5E35300227-AC
PID control