Siemens Module B3 manual Sp Int

Page 49

Automation and Drives - SCE

17.The setpoint value, the actual value and the manipulated variable now have to be wired to process values as follows.

Cycle time:

Time between the block call. Should correspond to the time that is set in OB 35.

SP INT:

Setpoint selection through analog input. Has to be normalized to a real format (refer to NW 2)

PV PER Actual value acceptance to analog input channel

LMN PER: Manipulated variable output at analog output

 

 

 

 

 

 

 

 

Preface Fundamentals

Discontinuous Action Controllerr

Controller Block (S)FB41

 

Setting the System Appendix

 

 

 

 

 

 

 

 

 

T I A Training Document

Page 49 of 64

Module

 

 

 

 

 

B3

Issued: 02/2008

 

 

 

Control Engineering with STEP 7

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Contents Module B3 Automation and Drives SCE Table of Contents Automation and Drives SCE Frequency Converter at Simatic S7 To 3 days Module C To 3 days Module DLearning Objective PrerequisitesPLC Hardware and software requiredTasks of Control Engineering Fundamentals of Control EngineeringControlled Variable Components of a Control LoopFeedback Variable r Setpoint Value w Disturbance Variable zComparing Element Controlling ElementControlled System ActuatorDead Time Characteristics Step Function for Examining Controlled Systems ForAutomation and Drives SCE Time constant Proportional Controlled System with a Time DelayTu Delay time Tg Transition time Proportional Controlled System with Two Time DelaysControllability of P-Tn systems Proportional Controlled System with n Time Delays Controlled Systems without Inherent Regulation Types of Controllers Two Position Controllers Hysteresis Switch-On Value Manipulated Variable TimeThree Position Controllers Basic Types of Continuous Controllers Proportional Controllers P-Controller Automation and Drives SCE Integral Action Controllers I- Controller WithController Layout PI ControllersPID Controllers Derivative Action Controllers D-ControllerObjectives for Controller Adjustment 450.85 Digital Controllers DAC Preface Fundamentals YES StructogramExercise Assignment List Symbol Address CommentNetwork Possible Solution for the PLC ProgramD24/AIFillSetpNorm/Norm.value for level setpoint Network 10 Title Task Definition for PID Standard Controller Function Diagram of the control system with a PID controller Use FB 41 ContcDescription Exercise Example Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE SP INT PLC’ Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Tu-TgApproximation GeneralT g Approximation Setting the PI-Controller according to Ziegler-Nichols For setpoint characteristic MAN Solution of the PLC program Setpoint Setting the PI controller according to Ziegler-NicholsAppendix Diagram of the controller blockComrst Bool False Input Parameters Data Value Range Default Description TypeParameter Data Type Value Range Default Lmnhlm Real Lmnllm Output Parameters Parameter Data Value Range Default Description Type