Siemens SIMATIC S7-1200

Technical specifications
A.10 Analog signal modules (SMs)
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1471
A.10.6
Measurement ranges of the analog inputs for voltage and current (SB and SM)
Table A- 159 Analog input representation for voltage (SB and SM)
System
Voltage Measuring Range
Decimal
Hexadecimal
±10 V
±5 V
±2.5 V
±1.25 V
32767
7FFF
1
11.851 V
5.926 V
2.963 V
1.481 V
Overflow
32512
7F00
32511
7EFF
11.759 V
5.879 V
2.940 V
1.470 V
Overshoot range
27649
6C01
27648 6C00 10 V 5 V 2.5 V 1.250 V Rated range
20736
5100
7.5 V
3.75 V
1.875 V
0.938 V
1
1
361.7 μV
180.8 μV
90.4 μV
45.2 μV
0
0
0 V
0 V
0 V
0 V
-1
FFFF
-20736
AF00
-7.5 V
-3.75 V
-1.875 V
-0.938 V
-27648
9400
-10 V
-5 V
-2.5 V
-1.250 V
-27649
93FF
Undershoot range
-32512
8100
-11.759 V
-5.879 V
-2.940 V
-1.470 V
-32513
80FF
Underflow
-32768
8000
-11.851 V
-5.926 V
-2.963 V
-1.481 V
1
7FFF can be returned for one of the following reasons: overflow (as noted in this table), before valid values are available
(for example immediately upon a power up), or if a wire break is detected.
Table A- 160 Analog input representation for current (SB and SM)
System
Current measuring range
Decimal
Hexadecimal
0 mA to 20 mA
4 mA to 20 mA
32767
7FFF
> 23.52 mA
> 22.81 mA
Overflow
32511
7EFF
23.52 mA
22.81 mA
Overshoot range
27649
6C01
27648
6C00
20 mA
20 mA
Nominal range
20736
5100
15 mA
16 mA
1
1
723.4 nA
4 mA + 578.7 nA
0 0 0 mA 4 mA
-1
FFFF
Undershoot range
-4864 ED00 -3.52 mA 1.185 mA
32767
1
7FFF
< 1.185 mA
Underflow (0 to 20 mA)
Wire break (4 to 20 mA)
-32768
8000
< -3.52 mA
1
The wire break value of 32767 (16#7FFF) is always returned regardless of the state of the wire break alarm.
See also
Determining the type of wire break condition from an SM 1231 module (Page 1349)