Siemens SIMATIC S7 System Manual page 591

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STEP 7-Micro/WIN SMART opens the PID control panel if the connected CPU is in RUN

The PID control panel includes the following fields:

● Current values: The values of the SP (Setpoint), PV (Process Variable), OUT (Output),

Sample Time, Gain, Integral time, and Derivative time are displayed. The SP, PV, OUT

are shown in green, red, and blue, respectively; the same color legend is used to plot the

PV, SP, and OUT values.

● Graphical display: The graphical display shows color-coded plots of the PV, SP, and

Output as a function of time. The PV and SP share the same vertical scale which is

located at the left hand side of the graph while the vertical scale for the output is located

on the right hand side of the graph.

● Tuning Parameters: At the bottom left-hand side of the screen are the Tuning Parameters

(Minutes). Here, the Gain, Integral Time, and Derivative Time values are displayed. You

click in the "Calculated" column to modify any one of the three sources for these values.

● "Update CPU" button: You can use the" Update CPU" button to transfer the displayed

Gain, Integral Time, and Derivative Time values to the CPU for the PID loop that is being

monitored. You can use the "Start" button to initiate an auto-tuning sequence. Once an

auto-tuning sequence has started, the "Start" button becomes a "Stop" button.

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

PID loops and tuning

11.7 PID Tune control panel

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Troubleshooting

Simatic s7-200 smart