Siemens ET 200S - Page 473

Analog Electronic Modules
12-117
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
Analog Value Generation
Measuring principle Integrative
Integration time/conversion
time/resolution per channel:
 Integration time
parameterizable
Yes
 Interference frequency
suppression in Hz
60 50
 Integration time in
milliseconds
16.7 20
 Basic conversion time
including Integration
time in milliseconds
55 65
 Additional conversion
time for wire break
check diagnosis in ms
20 20
 Cycle time in ms Number of active
channels per
module 
conversion time
 Resolution (including
overrange)
15 bits plus sign
Suppression of Interference, Limits of Error
Interference voltage sup-
pression for f = n x
(f1"1%), (f1 = interference
frequency)
 Common-mode
interference (U
pp
)
 Series-mode
interference
(peak interference
value < rated value of
input range)
Min. 90 dB
Min. 70 dB
Crosstalk between the in-
puts
Min. –50 dB
Operational limit (in the en-
tire temperature range, with
reference to the input
range)
1
"0.6%
Basic error limit (operational
limit at 25C with reference
to input range)
1
"0.4%
Temperature error (with re-
ference to the input range)
"0.005%/K
Linearity error (with refe-
rence to the input range)
"0.01%
Repeatability
(in steady state at 25C
with reference to input
range)
"0.05%
Data for Selecting a 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 MΩ
Permitted input voltage
(destruction limit)
"10 V, continuous
Connection of the sensors
 For measuring voltage Possible
Characteristic curve lineari-
zation
Yes, parameteriza-
ble for type E, N, J,
K, L, S, R, B, T to
IEC 584
Temperature compensation
 Internal temperature
compensation
Not possible
 External temperature
compensation by
looping a compensating
box into the measuring
circuit
Possible, one
external
compensating box
per
channel
 External compensation
by means of
temperature value
obtained at an analog
module of the same
ET 200S station
Yes
Smoothing of the measured
values
Yes, parameteriza-
ble in 4 steps by
means of digital filte-
ring
Step
None
Weak
Medium
Strong
Time constant
1 x cycle time
4 x cycle time
32 x cycle time
64 x cycle time
1
For type N: as of –150 C,
type B: as of 200 C,
type T: as of –230 C