Siemens SIMATIC S7-1200 - Page 166

Technical specifications
A.2 Fail-Safe CPU technical specifications
S7-1200 Functional Safety Manual
166 Manual, 02/2015, A5E03470344-AA
Measurement ranges of the analog inputs for voltage of the CPU
Table A- 38 Analog input representation for voltage of the CPU
System
Voltage Measuring Range
Decimal
Hexadecimal
0 to 10 V
32767
7FFF
11.851 V
Overflow
32512
7F00
32511 7EFF 11.759 V Overshoot range
27649
6C01
27648
6C00
10 V
Rated range
20736
5100
7.5 V
34
22
12 mV
0
0
0 V
Negative values Negative values are not sup-
ported
Analog output specifications
Table A- 39 Analog outputs
Technical data
Description
Number of outputs
2
Type
Current
Full-scale range
0 to 20 mA
Full-scale range (data word)
0 to 27648
Overshoot range
20.01 to 23.52 mA
Overshoot range (data word)
27649 to 32511
Overflow range
see footnote
1
Overflow range data word
32512 to 32767
Resolution
10 bits
Output drive impedance
≤500 Ω max.
Isolation (field side to logic)
None
Accuracy (25 °C / 0 to 55 °C) 3.0% / 3.5% of full-scale
Settling time 2 ms
Cable length (meters) 100 m, shielded twisted pair
1
In an overflow condition, analog outputs will behave according to the device configuration properties settings. In the
"Reaction to CPU STOP" parameter, select either: "Use substitute value" or "Keep last value".