Siemens SIMATIC ET 200S - Page 499

Analog Electronic Modules
12-93
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Analog Value Formation
Measurement principle integrating
Integration / conversion
time / resolution per
channel:
• Integration time
selectable
Yes
• Interference frequency
suppression in Hz
60 50
• Integrationtimeinms 16.7 20
• Basic conversion time
incl. integration time in
ms
55 65
• Additional conversion
time for wire break
diagnostics in ms
20 20
• Cycletimeinms Number of active
channels per
module x conversion
time
• Resolution (incl.
overshoot range)
15 bits + sign
Interference Suppression, Error Limits
Interference voltage sup-
pression for f= n x (f11%),
(f1 = interference
frequency)
• 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 complete tempera-
ture range, in relation to in-
put range)
1
0.6 %
Basic error limit (operational
error limit at 25 _C, related
to the input range)
1)
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
• Voltage 80 mV/min. 1 MΩ
• Thermocouple Type E, N, J, K, L, S,
R, B, T/min. 1 M
Permitted continuous input
voltage (destruction limit)
10 V, continuous
Connection of signal
generators
• For voltage
measurement
possible
Characteristics linearization Yes, configurable for
Type E, N, J, K, L, S,
R, B, T as per
IEC 584
Temperature compensation
• Internal temperature
compensation
Not possible
• External temperature
compensation by
looping a compensation
unit into the measuring
circuit
Possible, one
external
compensation
unit per channel
• External compensation
by means of
temperature value
acquired at an analog
module of the same
ET 200S station
Yes
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
1)
with Type N: from --150 _C, Type B:
from 200 _C,
Type T: from --230 _C