Siemens SIMATIC ET 200S Manual page 475

Analog Value Formation
Measurement principle
Integration and cycle time /
resolution per channel:
•
Integration time
selectable
•
Interference frequency
suppression in Hz
•
Integration time in ms
•
Conversion time in ms
•
Cycle time in ms
•
Resolution (incl.
overshoot range)
Interference Suppression, Error Limits
Interference voltage sup-
pression for f= n x (f11%),
(f1 = interference frequen-
cy)
•
Common mode
interference
(peak value of
interference < rated
value of the input range)
Crosstalk between inputs
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
integrating
Yes
60 50
16,7 20
55 65
Number of active
channels per
module
¢
conversion time
20 mA/13 Bit + VZ
¦
4 to 20 mA/13 bits
min. 70 dB
min. -- 50 dB
Analog Electronic Modules
Operational error limits
(across the temperature
range, in relation to input
range)
Basic error limit (operational
error limit at 25 _C, related
to the input range)
Temperature error (in rela-
tion to input range)
Linearity error (relative to
the input range)
Repetition accuracy
(in transient state at 25 _C,
relative to input range)
Data for selection of the sensor
Input range (rated
value)/input resistance
•
Current
Permitted continuous input
current (destruction limit)
Smoothing of measured
values
Level
weak
medium
strong
0.6 %
0.4 %
0.005 %/K
0.01 %
0.05 %
20 mA/50 Ω
4 to 20 mA/50 Ω
40 mA
Yes, configurable in
4 stages by digital
filtering
Time constant
No 1 x cycle time
4 x cycle time
32 x cycle time
64 x cycle time
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