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3.9 Digital Digital controllers controllers
3.9 Digital Digital controllers controllers
Up to now, the main focus was on analog controllers, in other words, controllers that use the Up to now, the main focus was on analog controllers, in other words, controllers that use the system error, which exists as an analog value, to derive the controller output variable in an system error, which exists as an analog value, to derive the controller output variable in an analog manner. The diagram of this type of control loop is now well-known:
analog manner. The diagram of this type of control loop is now well-known:
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SCE Training Curriculum | TIA Portal Module 051-300, Edition 02/2016 | Digital Factory, DF FA SCE Training Curriculum | TIA Portal Module 051-300, Edition 02/2016 | Digital Factory, DF FA
The advantages resulting from digital implementation of the controller are accompanied by The advantages resulting from digital implementation of the controller are accompanied by various problems. For this reason, the size of some variables related to the digital controller various problems. For this reason, the size of some variables related to the digital controller must be chosen large enough to prevent the accuracy of the closed loop control from suffering must be chosen large enough to prevent the accuracy of the closed loop control from suffering too much from digitization.
too much from digitization.
Quality criteria for digital computers are:
Quality criteria for digital computers are:
–
– The The quantization quantization resolution resolution of of the the digital-to-analog digital-to-analog converterconverter
This specifies how fine the continuous value range is digitally mapped. The chosen This specifies how fine the continuous value range is digitally mapped. The chosen resolution must be high enough that none of the finer points important for the closed loop resolution must be high enough that none of the finer points important for the closed loop control are lost.
control are lost.
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SCE Training Curriculum | TIA Portal Module 051-300, Edition 02/2016 | Digital Factory, DF FA SCE Training Curriculum | TIA Portal Module 051-300, Edition 02/2016 | Digital Factory, DF FA
4 Task 4 Task
In this chapter, a PID controller for speed control will be added to the program from chapter In this chapter, a PID controller for speed control will be added to the program from chapter
"SCE_EN_031-500 Analog Values_S7-1200". The call-up of the
"SCE_EN_031-500 Analog Values_S7-1200". The call-up of the
"MOTOR_SPEEDCONTROL" [FC10] function must be deleted for this.
"MOTOR_SPEEDCONTROL" [FC10] function must be deleted for this.
5 Planning
5 Planning
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SCE Training Curriculum | TIA Portal Module 051-300, Edition 02/2016 | Digital Factory, DF FA SCE Training Curriculum | TIA Portal Module 051-300, Edition 02/2016 | Digital Factory, DF FA