Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 162)

Technical data of CPU 31xC
6.6 Technical data of the integrated I/O
CPU 31xC and CPU 31x, Technical data
6-52
Manual, Edition 08/2004, A5E00105475-05
Technical data
Time constant of the input filter
0,38 ms
Basic processing time 1 ms
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 < 0,7 %
• Resistance < 3 %
Temperature error (in relation to input range) ± 0,006 %/K
Linearity error (referred to input range) ± 0,06 %
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
• Resistance 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;