Siemens SIMATIC ET 200S Manual page 499

Analog Value Formation
Measurement principle
Integration / conversion
time / resolution per
channel:
•
Integration time
selectable
•
Interference frequency
suppression in Hz
•
Integration time in ms
•
Basic conversion time
incl. integration time in
ms
•
Additional conversion
time for wire break
diagnostics in ms
•
Cycle time in ms
•
Resolution (incl.
overshoot range)
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)
Crosstalk between inputs
Operational error limits
(across complete tempera-
ture range, in relation to in-
1
put range)
Basic error limit (operational
error limit at 25 _C, related
1)
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)
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
integrating
Yes
60 50
16.7 20
55 65
20 20
Number of active
channels per
module x conversion
time
15 bits + sign
min. 90 dB
min. 70 dB
min. --50 dB
0.6 %
0.4 %
0.005 %/K
0.01 %
0.05 %
Analog Electronic Modules
Data for selection of the sensor
Input range (rated
value)/input resistance
•
Voltage
•
Thermocouple
Permitted continuous input
voltage (destruction limit)
Connection of signal
generators
•
For voltage
measurement
Characteristics linearization
Temperature compensation
•
Internal temperature
compensation
•
External temperature
compensation by
looping a compensation
unit into the measuring
circuit
•
External compensation
by means of
temperature value
acquired at an analog
module of the same
ET 200S station
Smoothing of measured
values
Level
weak
medium
strong
1)
with Type N: from --150 _C, Type B:
from 200 _C,
Type T: from --230 _C
80 mV/min. 1 MΩ
Type E, N, J, K, L, S,
R, B, T/min. 1 M
10 V, continuous
possible
Yes, configurable for
Type E, N, J, K, L, S,
R, B, T as per
IEC 584
Not possible
Possible, one
external
compensation
unit per channel
Yes
Yes, configurable in
4 stages by digital
filtering
Time constant
No 1 x cycle time
4 x cycle time
32 x cycle time
64 x cycle time
12-93