Distributed I/O System ET 200S

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Analog electronics modules 4.3 Basics of analog value processing Extension to a reference junction The thermocouples can be extended from their connection point by means of equalizing lines to the reference junction (transition to Cu line) or the compensating box. The reference junction can also be an ET 200S terminal module. The equalization lines are made of the same material as the wires of the thermocouple. The incoming lines are made of copper. Ensure correct polarity when connecting. Use of a compensating box The influence of the temperature on the reference junction of a thermocouple (for example, terminal boxes) can be adjusted with a compensating box. The compensating box contains a bridge circuit that is adjusted for a certain reference junction temperature (compensating temperature). You connect the thermocouples or their adjustment lines to the compensating box. The compensating box then forms the reference junction. If the actual reference temperature differs from the compensating temperature, the temperature-dependent bridge resistance changes. A positive or negative compensation voltage occurs that is added to the thermo-electromotive force. Compensating boxes with a reference junction temperature of 0 °C must be used for the compensation of the analog input modules. Pay attention to: • The compensating box must be supplied on an isolated basis. • The power supply unit must have adequate interference filtering (by means of a grounded shielding winding, for example). ET 200S 4-20 Manual, 12/2005, A5E00514527-03
Analog electronics modules 4.3 Basics of analog value processing Compensation by means of a resistance thermometer at the 2AI RTD If thermocouples that are connected to the inputs of the 2AI TC have the same reference junction, compensate by means of a 2AI RTD. For both channels of the 2AI TC module, you can select "RTD" or "None" as the reference junction. If you select "RTD," the same reference junction (RTD channel) is always used for both channels. ET 200S Manual, 12/2005, A5E00514527-03 4-21 Figure 4-1 Compensation by means of the 2AI RTD
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SIMATIC Distributed I/O System ET 2
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Table of contents 1 Terminal module
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Table of contents 4.3 Basics of ana
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Table of contents Table 4-10 SIMATI
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Terminal modules 1.1 Terminal modul
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Terminal modules 1.3 TM-P15S22-01,
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Terminal modules 1.4 TM-P30S44-A0 a
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Terminal modules 1.5 TM-PF30S47-F1
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Terminal modules 1.6 TM-E15S26-A1,
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Terminal modules 1.8 TM-E15S24-01,
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Terminal modules 1.9 TM-E15S23-01,
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Terminal modules 1.10 Terminal modu
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Terminal modules 1.12 TM-E30S44-01
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Terminal modules 1.13 TM-C120S and
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Terminal modules 1.14 TE-U120S4x10
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Power modules 2.2 Parameters for po
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Power modules 2.3 PM-E 24 VDC power
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Power modules 2.4 PM-E 24-48 VDC po
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Power modules 2.4 PM-E 24-48 VDC po
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Power modules 2.5 PM-E 24-48 VDC/24
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Power modules 2.5 PM-E 24-48 VDC/24
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Power modules 2.6 Placing power mod
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Power modules 2.7 Example of a conf
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Power modules 2.8 Finding the corre
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Digital electronic modules 3.1 Para
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Digital electronic modules 3.3 2DI
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Digital electronic modules 3.12 2DO
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Digital electronic modules 3.12 2DO
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Digital electronic modules 3.13 Sta
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Digital electronic modules 3.13 Sta
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Analog electronics modules 4.14 2AI
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Analog electronics modules 4.19 2AO
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4 IQ-SENSE (6ES7138-4GA00-0AB0) 5.2
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4 IQ-SENSE (6ES7138-4GA00-0AB0) 5.2
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4 IQ-SENSE (6ES7138-4GA00-0AB0) 5.2
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4 IQ-SENSE (6ES7138-4GA00-0AB0) 5.3
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4 IQ-SENSE (6ES7138-4GA00-0AB0) 5.3
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4 IQ-SENSE (6ES7138-4GA00-0AB0) 5.3
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4 IQ-SENSE (6ES7138-4GA00-0AB0) 5.4
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4 IQ-SENSE (6ES7138-4GA00-0AB0) 5.4
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Potential distributor module 6.1 Po
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Potential distributor module 6.1 Po
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RESERVE modules Pin assignment Note
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Glossary Configuration Connecting t
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Glossary Frequency converter Ground
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Glossary Power modules Prewiring Pr
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Glossary Real time Reference potent
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Glossary Terminal modules Terminati
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Index Analog electronic module 2AI
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Index T Terminal module TM-E15S24-0
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Safety Guidelines This manual conta
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Table of contents ET 200S iv Produc
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Introduction ET 200S 1-2 Product In
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New Information About the "ET 200S
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Index ET 200S Index-2 Product Infor
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Safety Guidelines This manual conta
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Table of contents Distributed I/O S
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Introduction 1.1 Introduction Distr
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Product Information 2.2 Digital Ele
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Index Distributed I/O System ET 200
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Product Information on Manual Distr
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Distributed I/O System ET 200S

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