Beckhoff ELX3312, Operating Manual

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Table of contents
ELX3312 and ELX3314 3 Version: 1.3.0
Table of contents
1 Foreword .................................................................................................................................................... 5
1.1 Notes on the documentation.............................................................................................................. 5
1.2 Safety instructions ............................................................................................................................. 6
1.3 Documentation Issue Status.............................................................................................................. 7
1.4 Marking of ELX terminals .................................................................................................................. 8
2 Product overview..................................................................................................................................... 12
2.1 ELX3312 - Introduction .................................................................................................................... 12
2.2 ELX3314 - Introduction .................................................................................................................... 13
2.3 Technical data ................................................................................................................................. 14
2.4 Intended use .................................................................................................................................... 16
3 Mounting and wiring................................................................................................................................ 17
3.1 Special conditions of use for ELX terminals .................................................................................... 17
3.2 Installation notes for ELX terminals ................................................................................................. 17
3.3 Arrangement of ELX terminals within a bus terminal block ............................................................. 19
3.4 Installation position and minimum distances ................................................................................... 22
3.5 Installation of ELX terminals on mounting rails................................................................................ 23
3.6 Connection ...................................................................................................................................... 25
3.6.1 Connection system .......................................................................................................... 25
3.6.2 Wiring............................................................................................................................... 26
3.6.3 Proper line connection ..................................................................................................... 27
3.6.4 Shielding and potential separation................................................................................... 27
3.6.5 ELX3312 - Contact assignment ....................................................................................... 28
3.6.6 ELX3314 - Contact assignment ....................................................................................... 30
3.7 Disposal ........................................................................................................................................... 31
4 Basic function principles ........................................................................................................................ 32
4.1 EtherCAT basics.............................................................................................................................. 32
4.2 Notices on analog specifications ..................................................................................................... 32
4.2.1 Full scale value (FSV)...................................................................................................... 32
4.2.2 Measuring error/ measurement deviation ........................................................................ 32
4.2.3 Temperature coefficient tK [ppm/K] ................................................................................. 33
4.2.4 Single-ended/differential typification ................................................................................ 34
4.2.5 Common-mode voltage and reference ground (based on differential inputs).................. 37
4.2.6 Dielectric strength ............................................................................................................ 37
4.2.7 Temporal aspects of analog/digital conversion................................................................ 38
4.3 Basics of thermoelectricity and thermocouples ............................................................................... 41
4.4 Measurement of thermocouples (with measurement uncertainties) ................................................ 43
4.5 Use of grounded thermocouples ..................................................................................................... 55
5 Parameterization and programming ...................................................................................................... 56
5.1 Basics of the measurement functions.............................................................................................. 56
5.2 Data processing............................................................................................................................... 56
5.3 Settings............................................................................................................................................ 57
5.3.1 Presentation, index 0x80n0:02 ........................................................................................ 57
5.3.2 Siemens bits, index 0x80n0:05........................................................................................ 58