Siemens CPU 312 - Page 162

Technical data of CPU 31xC
6.6 Technical data of the integrated I/O
CPU 31xC and CPU 31x, Technical Data
6-50 Manual, 01/2006 Edition, A5E00105475-06
Technical data
Interference suppression, error limits
Interference voltage suppression for f = nx (f1 ± 1 %), (f1 = interference
frequency), n = 1, 2
• Commonmode interference (U
CM
< 1.0 V)
> 40 dB
• Feedback interference (peak value of the interference < rated value of
the input range)
> 30 dB
Crosstalk between the inputs > 60 dB
Operational error limits (across the temperature range, in relation to input
range)
• Voltage/current
< 1 %
• Resistance
< 5 %
Basic error limit (operational limit at 25 °C, in relation to input range)
• Voltage/current
– Linearity error during measurement of current and voltage
(related to input range)
< 0,7 %
± 0,06 %
• Existence
– Linearity error during resistance measurement
(related to input range)
< 3 %
± 0,2 %
Temperature error (in relation to input range) ± 0,006 %/K
Repeat accuracy (in transient state at 25 °C, in relation to input range) ± 0,06 %
Status, interrupts, diagnostics
Interrupts
• no interrupts when operated as standard
I/O
Diagnostics functions
• no diagnostics when operated as
standard I/O
• For using technological functions, please
refer to the
Technological Functions
Manual.
Encoder selection data
Input ranges (rated value)/input resistance
• Voltage
± 10 V/100 kΩ
0 V to 10 V/100 kΩ
• Current
± 20 mA/50 Ω
0 mA to 20 mA/50 Ω
4 mA to 20 mA/50 Ω
• Existence
0 Ω to 600 Ω/10 MΩ
• Resistance thermometer
Pt 100/10 MΩ
Permitted continuous input voltage (destruction limit)
• For voltage inputs
Max. 30 V
• For current inputs
Max. 2.5 V
Permitted continuous input current (destruction limit)
• For voltage inputs
Max. 0,5 mA;
• For current inputs
Max. 50 mA;