Siemens SIMATIC ET 200S - Page 467

Analog Electronic Modules
12-61
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
• Cycle time per module
in ms
33 40
• Resolution (incl.
overshoot range)
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 complete tempera-
ture range, in relation to in-
put range)
0.4 %
Basic error limit (operational
error limit at 25 _C, related
to the input range)
0.3 %
Temperature error (in rela-
tion to input range)
0.003 %/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 4to20mA/25Ω
Permitted continuous input
current (destruction limit)
approx. 30 mA
(electronically
limited)
Load of the 2-wire
transducer
max.750 Ω
Smoothing of measured
values
yes, configurable in
4 levels
Level
No
weak
medium
strong
Time constant
1 x cycle time
4 x cycle time
16 x cycle time
32 x cycle time