Siemens Simatic S7 Series System Manual

PID loops and tuning
11.7 PID Tune control panel
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
477
STEP 7-Micro/WIN SMART opens the PID control panel if the connected CPU is in RUN
mode:
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.

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.