Siemens SIMATIC User Manual

Principles of analog modules
5.1 Representation of the values for analog input channels
S7-300 Module data
262 Manual, 06/2017, A5E00105505-AJ
5.1 Representation of the values for analog input channels
Measured value resolution
The resolution of the analog values may differ, based on the analog module and module
parameters. At resolutions < 15 bits, all bits identified by "x" are set to "0".
Note
This resolution does not apply to temperature values. Converted temperature values are t
he
result of a conversion in the analog module.
Table 5- 2 Supported analog value resolutions
Resolution
in bits (+ sign)
Units
Analog value
dec
hex
high byte
low byte
8
128
80
H
Sign 0 0 0 0 0 0 0
1 x x x x x x x
9
64
40
H
Sign 0 0 0 0 0 0 0
0 1 x x x x x x
10
32
20
H
Sign 0 0 0 0 0 0 0
0 0 1 x x x x x
11
16
10
H
Sign 0 0 0 0 0 0 0
0 0 0 1 x x x x
12
8
8
H
Sign 0 0 0 0 0 0 0
0 0 0 0 1 x x x
13
4
4
H
Sign 0 0 0 0 0 0 0
0 0 0 0 0 1 x x
14
2
2
H
Sign 0 0 0 0 0 0 0
0 0 0 0 0 0 1 x
15
1
1
H
Sign 0 0 0 0 0 0 0
0 0 0 0 0 0 0 1
Binary representation of input ranges
Table 5- 3 Bipolar input ranges
Units
Measured
value in %
Data word
Range
2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
32767
>118.515
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Overflow
32511
117.589
0
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
Overshoot
range
27649
>100.004
0
1
1
0
1
1
0
0
0
0
0
0
0
0
0
1
27648
100.000
0
1
1
0
1
1
0
0
0
0
0
0
0
0
0
0
Rated range
1
0.003617
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0.000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-1
-0.003617
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
-27648 -100.000 1 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0
-27649
≤-100.004
1
0
0
1
0
0
1
1
1
1
1
1
1
1
1
1
Undershoot
range
-32512
-117.593
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
-32768
≤-117.596
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Underflow

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Brand	Siemens
Model	SIMATIC
Category	Control Unit
Language	English