Distributed I/O System ET 200S

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Analog electronics modules 4.3 Basics of analog value processing Note Ensure that this potential difference UISO does not exceed the permitted value. If there is a possibility of exceeding the permitted value, make a connection between terminal MANA and the central grounding point. Connecting measuring sensors to analog inputs Between the measuring lines M- of the input channels and the reference point of the measuring circuit MANA there can be only a limited potential difference UCM (common-mode voltage). To ensure that the permitted value is not exceeded, you must take different steps depending on the whether the sensors are isolated or non-isolated. The steps you have to take are described in this chapter. Generally speaking, however, when connecting two-wire measuring transducers for current measurement and when connecting resistance-type sensors, you should not make a connection from M- to MANA. This also applies to inputs that have been assigned parameters correspondingly but unused. Note For the analog input modules 2AI U, 2AI RTD, and 2AI TC, you must short-circuit unused analog inputs. Abbreviations used The meanings of the abbreviations in the figures below are as follows: M + Measuring line (positive) M - Measuring line (negative) MANA Reference potential of the analog measuring circuit M Frame connection L + Rated load voltage 24 VDC UCM Potential difference between inputs and reference potential of the measuring circuit MANA UISO Potential difference between MANA and central grounding point ET 200S 4-16 Manual, 12/2005, A5E00514527-03
Analog electronics modules 4.3 Basics of analog value processing Isolated measuring sensors The isolated measuring sensors are not connected to the local ground potential. They can be floating. Depending on local conditions or interference, potential differences UCM (static or dynamic) can occur between the measuring lines M- of the input channels and the reference point of the measuring circuit MANA. To ensure that the permitted value for UCM is not exceeded in environments with strong EMC interference, the following applies: • In the case of the analog input modules 2AI U, 2AI I 4WIRE, and 2AI TC: Connect M- with MANA! • When connecting two-wire measuring transducers for current measurement and when connecting resistance-type sensors, you must not connect M- to MANA. The following figure illustrates the connection of isolated measuring sensors to the floating analog input modules. Connection of isolated measuring sensors to a floating analog input module: 6 5 4 (1) Logic (2) Backplane bus (3) Ground bus (4) Central grounding point (5) Recommended connection (6) Isolated measuring sensors 3 ET 200S Manual, 12/2005, A5E00514527-03 4-17 1 2
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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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Analog electronics modules 4.13 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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