Appendix
PCD0
26/766 E2
(HB_PCD0 26 766_E2.DOC)
SAIA-Burgess Controls Ltd.
Page 183
0...20 mA SIMATIC S5 format for inputs (module 4AI/4AO 20mA)
Measured value
Binary representation
A
E
O
Units
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
A
Activity bit always = 0
E
Error bit always = 0
O
Overflow bit < 1.179 mA = 1 und >= 20 mA = 1
The measuring range 4 ... 20 mA is divided into 2048 units in the
interval 512 ... 2560.
The software generates an overflow message under 1,179 mA.
0...20 mA SIMATIC S5 format for outputs (module 4AI/4AO 20mA)
Measured value
Binary representation
x
x
x
x
Units
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
20,000 mA
0
1
0
0
0
0
0
0
0
0
0
0
x
x
x
x
1024
19,984 mA
0
0
1
1
1
1
1
1
1
1
1
1
x
x
x
x
1023
12,000 mA
0
0
1
0
0
0
0
0
0
0
0
0
x
x
x
x
512
4,016 mA
0
0
0
0
0
0
0
0
0
0
0
1
x
x
x
x
1
4,000 mA
0
0
0
0
0
0
0
0
0
0
0
0
x
x
x
x
0
3,984 mA
1
1
1
1
1
1
1
1
1
1
1
1
x
x
x
x
-1
0,000 mA
1
1
1
1
0
0
0
0
0
0
0
0
x
x
x
x
-256
x
No meaning
The measuring range 4 ... 20 mA is divided into 1024 units.
This corresponds to a resolution of 10 bit or 0.015625 mA/digit.
4...20 mA in S7 format (module 4AI 4..20mA, 4AI/4AO 4..20mA)
Binary
Measured value
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Dec.
Hex.
20.0 mA
0
1
1
0
1
1
0
0
0
0
0
0
0
0
0
0
27648
6C00
10.0 mA
0
0
1
0
1
0
0
0
1
0
0
0
0
0
0
0
10368
2880
4.1 mA
0
0
0
0
0
0
0
0
1
0
1
0
1
1
0
1
173
00AD
4.0 mA
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3.9 mA
1
1
1
1
1
1
1
1
0
1
0
1
0
0
1
1
-173
FF53
0.0 mA
1
1
1
0
0
1
0
1
0
0
1
0
0
0
0
0
-6880
E520
The measuring range 4 ... 20 mA is divided into 27648 units.