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Siemens SIMATIC S7 - Page 72

Siemens SIMATIC S7
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Contents
4–3
IP244
C79000–B8576–C860–02
3.3 Heating Current Monitoring 4–83
3.3.1 Selecting the Heating Current Monitoring 4–83
3.3.2 Distribution of the Controller Channels 4–83
3.3.3 Input of Parameters for Heating Current Monitoring 4–85
3.3.4 Actual Current Value Monitoring 4–85
3.3.5 Indication and Signalling Concept of the Heating Current Monitoring 4–88
3.4 Special Function, Measured Value Acquisition at Channels 13 and 14 4–103
3.4.1 Selecting the Special Function 4–103
3.4.2 Stipulating the ADC Conversion Time 4–103
3.4.3 Processing Sequence of the Analog Inputs 4–103
3.4.4 Converting Voltage Values to Physical Values 4–104
3.4.5 Processing the Special Function 4–105
3.4.6 Miscellaneous 4–106
3.5 Extensions to the Message Exchange 4–107
4 Notes on Controller Settings 4–123
4.1 Characteristics of the Controlled System 4–123
4.2 Controller Type (2-Step, 3-Step Controllers) 4–124
4.3 Control Action with Different Feedback Structures 4–127
4.4 Selecting the Controller Structure for a Given System 4–134
4.5 Setting the Controller Characteristics (Tuning) 4–135
4.6 Determining the System Parameters for 2/3-Step Controllers
(when Main Control Byte 1, Bit 2 = 0) 4–137
4.7 Determining the System Parameters for Purely Cooling Controllers
(when Control Byte 1, Bit 0 = 0 and Bit 2 = 1) 4–139

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