Siemens S7-300 appendix Interference suppression, error limits, Status, interrupts, diagnostics

Technical data of CPU 31xC

6.6 Technical data of the integrated I/O

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 (UCM < 1.0 V)		> 40 dB
• Feedback interference (peak value of the interference < rated value of		> 30 dB
	the input range)
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;

6-52	CPU 31xC and CPU 31x, Technical data
	Manual, Edition 08/2004, A5E00105475-05