Input (Ai) Measurement Ranges For Voltage And Current - Siemens SIMATIC S7-1200 Manual

Technical specifications
A.6 Specifications for the analog I/O
Technical data
Isolation (field side to logic)
Cable length (meters)
Diagnostics
Note 1: Refer to the analog input measurement ranges for voltage and current (Page 258) to determine the
overshoot/undershoot and overflow/underflow ranges.
Note 2: Refer to the step response times (Page 259) to determine the smoothing and noise rejection values.
Note 3: For SM 1231 AI 4 (13 bit): If a voltage greater than +30 VDC or less than -15 VDC is applied to the input, the
resulting value will be unknown and the corresponding overflow or underflow may not be active.
A.6.2

Input (AI) measurement ranges for voltage and current

Table A- 35 Analog input representation for voltage
System
Decimal Hexadecimal
32767 7FFF
32512 7F00
32511 7EFF
27649 6C01
27648 6C00
20736 5100
1 1
0 0
-1 FFFF
-20736 AF00
-27648 9400
-27649 93FF
-32512 8100
-32513 80FF
-32768 8000
258
CPU
None
100 m, shielded twisted pair 100 m, twisted and shielded 100 m twisted and shielded
Overflow / underflow
±10 V ±5 V
11.851 V 5.926 V
11.759 V 5.879 V
10 V 5 V
7.5 V 3.75 V
361.7 μV 180.8 μV
0 V 0 V
-7.5 V -3.75 V
-10 V -5 V
-11.759 V -5.879 V
-11.851 V -5.926 V
SB
None
Overflow / underflow
Voltage Measuring Range
±2.5 V
2.963 V Overflow
2.940 V Overshoot range
2.5 V Rated range
1.875 V
90.4 μV
0 V
-1.875 V
-2.5 V
Undershoot range
-2.940 V
Underflow
-2.963 V
SM
None
Overflow / underflow
(see note 3)
24 VDC low voltage
0 to 10 V
11.851 V Overflow
11.759 V Overshoot
range
10 V Rated range
7.5 V
361.7 μV
0 V
Negative
values are not
supported
Easy Book
Manual, 11/2011, A5E02486774-04