Siemens SIMATIC S5-90U, Системное руководство

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S5-90U/S5-95U Module Spectrum
Please note that four-wire transducers require their own voltage supply and that the "+" pole of the
four-wire transducer must be connected to the corresponding "-" pole of the terminal block
(opposite connection technique to the two-wire transducer).
All "-" terminals of the four-wire transducer must be connected to terminal 2 of the terminal block.
The following must be observed when connecting four-wire transducers with more than two "-"
terminals:
•
Connect the "-" terminals to the same potential (terminal strip or terminal block) and
• Connect the terminal strip with terminal 2 of the terminal block.
Reason for this measure: Only 2 conductors may be connected at each terminal of the terminal
block.
If you use two-wire and four-wire transducers simultaneously, these must be connected as follows.
Please note that the four-wire transducers must be galvanically isolated from the module via
isolating transformers.
Figure 15-15. Connection of Two-Wire and Four-Wire Transducers (6ES5 464-8ME11)
a a a a
a a a a
a a a a
1
a a a
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a a a
3
a a a a a
a a a a a
a a a a a
a a a a a
10
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7
a a a
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a a a
9
a a a
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2
a a a a
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4
a a a
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6
a a a
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8
a a a
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5
a a a a
a a a a
a a a a
a a a a
a a a a
+
a a
a a
a a
a a
a a
-
Two-
wire
trans-
ducer
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a a a a
a a a a
a a a a
a a a a
M
a a a a a a
a a a a a a
a a a a a a
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L+
Two-
wire
trans-
ducer
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a a a a a
a a a a a
a a a a a
+
a a
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a a
a a
a a
-
Four-
wire
trans-
ducer
Four-
wire
trans-
ducer
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a a a a a
a a a a a
a a a a a
a a a a a
+
a a
a a
a a
a a
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-
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+
a a a a a
a a a a a
a a a a a
a a a a a
+
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a a a a a
a a a a a
a a a a a
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+
a a a
a a a
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-
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U
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a a a a a a a a a a a a
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a a a a a a a a a a a a
Isolating
transformer
EWA 4NEB 812 6115-02b
15-75