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7.2
Connecting Current and Voltage Sensors to Analog Input Modules
Observe the following rules to connect current and voltage sensors to analog
input modules:
Voltage Measure-
Module 464–8MA11/8MA21 is recommended for voltage measurement with
ment with Isola-
thermocouples. With floating sensors (e.g., isolated thermocouples), the per-
ted / Non–Isolated
missible potential difference V
Thermocouples
and the potential of the standard mounting rail must not be exceeded. To
avoid this, the negative potential of the sensor must be connected to the cen-
tral grounding point (see Figure 7-1).
Jumper terminals 1 and 2 together if you do not use compensation boxes.
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
When you have multi–channel operations, assign the channels in ascend-
ing order. This shortens the data cycle.
Use terminals 1 and 2
– for the connection of a compensating box (464–8MA11)
or
– for the supply of two–wire transducers (464–8ME11).
Terminals 1 and 2 cannot be used with the remaining analog input mod-
ules.
Short–circuit the terminals of unused inputs to increase interference im-
munity.
The potential difference between the common references of the inputs
must not exceed 1 V. To prevent this, set the reference potentials of the
sensors to a common reference potential.
CM
Analog Value Processing
between the minus terminals of the inputs
7-3
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