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fritz
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Joined: 26 Dec 2015
Posts: 179
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 Posted: 13/05/2019 17:07 Post subject: 3-Point Stepper Control with SIMATIC S7-1200/S7-1500 |
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3-Point Stepper Control with SIMATIC S7-1200/S7-1500
https://support.industry.siemens.com/cs/document/62154322/3-point-stepper-control-with-simatic-s7-1200-s7-1500
STEP 7 (TIA Portal) offers you the technology object "PID_3Step" to control valves and actuators with integrating behavior for SIMATIC S7-1200/S7-1500 PLC. The handling of this PID controller with self tuning is shown using a mixer tap as an example.
The valve of a mixer tap will be controlled according to a desired given temperature.
A three-way mixing valve with valve actuator is used. The valve is digital controlled in both directions. This is referred to as a 3-point stepper control.
Varying the valve position can yield any mixing ratio of hot and cold entering water and so the water outlet temperature.
The application on hand provides quick configuration and commissioning of your mixer tap.
The application also contains a simulation of the controlled system, which enables familiarizing yourself with all functions of "PID_3Step".
The following features can be conveniently operated via KTP900 Basic PN:
| Code: | Switching between automatic and manual mode
Transition time measurement of the valve
Visualization of the valve position
Trend curves of setpoint, process value and output value
Switching between the real controlled system and the simulation
Disturbance value control in simulation mode
Specifying the behavior in the case of errors and their simulation
Specifying the deadband width for energy saving operation
Manually specified control parameter and automatic tuning
Online monitoring of the "PID_3Step" controller block
Modifying the configuration during runtime
Advantages
PID Control
Simple programming with configurable blocks.
Simple commissioning through automatic calculation of the control parameters for optimal control quality and clear signal monitoring with trace function.
Integrated PID control
Specialized stepper controller for integrated actuators (e.g. valves).
Auto tuning
Innovative auto tuning with two different tuning methods for automatic calculation of the control parameters: pretuning and fine tuning during runtime.
Benefits
No additional hardware and software required (due to simulation of the controlled system).
Time saving due to simple automatic control parameter tuning for optimal control quality (PID controller). |
Downloads Version 2.0 for TIA Portal V15.1 or higher
https://support.industry.siemens.com/cs/attachments/62154322/100746401_S71x00_PidCompact_DOC_V2.0_en.pdf
https://support.industry.siemens.com/cs/attachments/62154322/62154322_S71200_Pid3Step_TiaV15.1_PROJ_V2.0.zip
https://support.industry.siemens.com/cs/attachments/62154322/62154322_S71500_Pid3Step_TiaV15.1_PROJ_V2.0.zip
Further Information
https://support.industry.siemens.com/cs/attachments/108210036/s71500_pid_control_function_manual_enUS_en-US.pdf
https://support.industry.siemens.com/cs/document/100746401/pid-control-with-pid_compact-for-simatic-s7-1200-s7-1500
https://support.industry.siemens.com/cs/document/79047707/closed-loop-control-of-simulated-controlled-systems-in-the-s7-1500-with-pid_compact-v2
https://support.industry.siemens.com/cs/document/103526819/single-and-multi-loop-controller-structures- (cascade-control)-with-pid_temp
https://support.industry.siemens.com/cs/document/109740463/multi-zone-control-with-pid_temp%e2%80%9d-for-simatic-s7-1200-s7-1500 |
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