Siemens SIMATIC S7-1200

Technical specifications
A.7 Specifications for the analog I/O
Easy Book
312 Manual, 03/2014, A5E02486774-AF
Technical data
CPU
SB
SM
Load impedance Single-ended: ≥100 KΩ Differential:
220 KΩ (voltage),
250 Ω (current)
Common mode:
55 KΩ (voltage),
55 KΩ (current)
Differential:
9 MΩ (voltage),
250 Ω (current)
Common mode:
4.5 MΩ (voltage),
4.5 MΩ (current)
Isolation (field side to logic)
None
None
None
Cable length (meters)
100 m, shielded twisted pair
100 m, twisted and shielded
100 m twisted and shielded
Diagnostics Overflow / underflow Overflow / underflow Overflow / underflow
24 VDC low voltage
Note 1: Refer to the analog input measurement ranges for voltage and current (Page 312) to determine the
overshoot/undershoot and overflow/underflow ranges.
Note 2: Refer to the step response times (Page 313) to determine the smoothing and noise rejection values.
A.7.2
Input (AI) measurement ranges for voltage and current
Table A- 37 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
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