Siemens SIMATIC ET 200S - Page 487

Analog Electronic Modules
12-81
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 110 130
• Cycletimeinms Number of active
channels per
module x conversion
time
• Resolution (incl.
overshoot range)
Pt100, Ni100/ 15 Bit
+VZ
150 Ω/14 Bit/
300 Ω, 600 Ω/15 Bit
Interference Suppression, Error Limits
Interference voltage sup-
pression for f= n x (f11%),
(f1 = interference frequen-
cy)
• Common mode
interference (U
SS
)
• Common mode
interference
(peak value of
interference < rated
value of the input range)
min. 90 dB
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
• Resistance 150 Ω/min. 2 MΩ
300 Ω/min. 2 MΩ
600 Ω/min. 2 MΩ
• Resistive thermo-
meter
Pt100/min. 2 MΩ
Ni100/min. 2 MΩ
Permitted continuous input
voltage (destruction limit)
Max. 9 V
Connection of signal
generators
• for measuring
resistance
-- 2 and 3-wire
connection
-- 4-wire connection
Yes, wire
resistances are also
measured, bridges
on T
R
Yes
Characteristics linearization Yes, configurable for
Pt100, Ni100
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