Siemens SIMATIC ET 200S Manual page 467

Analog Value Formation
Measurement principle
Integration and cycle time /
resolution per channel:
•
Integration time
selectable
•
Interference frequency
suppression in Hz
•
Integration time in ms
•
Cycle time per module
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
Operational error limits
(across complete tempera-
ture range, in relation to in-
put range)
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
integrating
Yes
60 50
16,7 20
33 40
4 to 20 mA/13 bits
min. 70 dB
min. --50 dB
0.4 %
Analog Electronic Modules
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)
Load of the 2-wire
transducer
Smoothing of measured
values
Level
weak
medium
strong
0.3 %
0.003 %/K
0.01 %
0.05 %
4 to 20 mA/25 Ω
approx. 30 mA
(electronically
limited)
max.750 Ω
yes, configurable in
4 levels
Time constant
No 1 x cycle time
4 x cycle time
16 x cycle time
32 x cycle time
12-61