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Appendix
©
2002 Wieland Electric GmbH Version 2.4* (December 2002)
114
Part no. 05.591.3389.0 © 2002 Wieland Electric GmbH
4.2.2 Data formats of current inputs/outputs
0...20 mA in two’s complement
Binary
Measured value
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
Dec.
Hex.
20 mA
0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 4095 0FFF
5 mA
0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1024 0400
0 mA
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0
0...20 mA
in
µ
A (0...20000)
Binary
Measured value
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
Dec.
Hex.
20 mA
0 1 0 0 1 1 1 0 0 0 1 0 0 0 0 0 20000 4E20
10 mA
0 1 0 0 1 1 1 0 0 0 0 1 0 0 0 0 10000 2710
0 mA
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0
From bus coupler software version 00.50, the display format can also be set to
SIMATIC S5 format:
0...20 mA SIMATIC S5 format for inputs (module 4AI/4AO 20mA)
Measured value
Binary display
T
F
Ü
Unit
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
20.000 mA
0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1 2560
19.992 mA
0 1 0 0 1 1 1 1 1 1 1 1 1 0 0 0 2559
16.000 mA
0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2048
4.000 mA
0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 512
3.992 mA
0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 511
3.000 mA
0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 384
1.179 mA
0 0 0 0 0 1 0 0 1 0 1 1 1 0 0 0 151
1.171 mA
0 0 0 0 0 1 0 0 1 0 1 1 0 0 0 1 150
0.000 mA
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
T
Status bit always = 0
F
Error bit always = 0
Ü
Overflow bit < 1.179 mA = 1 and
>= 20 mA = 1
The measuring range of 4 ... 20 mA is resolved at 2048 units with an interval of
512 ... 2560. An overflow signal is implemented under 1.179 mA by the software.