Siemens SIMATIC ET 200S - Page 475

Analog Electronic Modules
12-69
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Analog Value Formation
Measurement principle integrating
Integration and cycle time /
resolution per channel:
• Integration time
selectable
Yes
• Interference frequency
suppression in Hz
60 50
• Integrationtimeinms 16,7 20
• Conversion time in ms 55 65
• Cycletimeinms Number of active
channels per
module
¢
conversion time
• Resolution (incl.
overshoot range)
¦ 20 mA/13 Bit + VZ
4to20mA/13bits
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)
min. 70 dB
Crosstalk between inputs min. -- 50 dB
Operational error limits
(across the temperature
range, in relation to input
range)
0.6 %
Basic error limit (operational
error limit at 25 _C, related
to the input range)
0.4 %
Temperature error (in rela-
tion to input range)
0.005 %/K
Linearity error (relative to
the input range)
0.01 %
Repetition accuracy
(in transient state at 25 _C,
relative to input range)
0.05 %
Data for selection of the sensor
Input range (rated
value)/input resistance
• Current 20 mA/50 Ω
4to20mA/50Ω
Permitted continuous input
current (destruction limit)
40 mA
Smoothing of measured
values
Yes, configurable in
4 stages by digital
filtering
Level
No
weak
medium
strong
Time constant
1 x cycle time
4 x cycle time
32 x cycle time
64 x cycle time