Siemens SIMATIC ET 200S - Page 459

Analog Electronic Modules
12-53
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Analog Value Formation
Measurement principle Momentary value
encryption
Cycle time/resolution:
• Conversion time in ms
(per channel)
0.1
• Cycletimeinms
(per module)
1
• Resolution (incl.
overshoot range)
 10 V/ 13 Bit + VZ

5V/13Bit+VZ

2.5V/13Bit+VZ
1to5V/13bits
Interference Suppression, Error Limits
• Commonmode
interference
(U
cm
< 100 V
SS
)
>70dB
Crosstalk between inputs >50dB
Operational error limits
(across complete tempera-
ture range, in relation to
input range)
 0.3 %
Basic error limit (operational
error limit at 25 _C, related
to the input range)
0.2 %
Temperature error
(in relation to input range)
0.01 %/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 ranges (rated
value)/input resistance
• Voltage 10 V/min. 100 kΩ
5 V/mi n. 100 kΩ
2.5 V/ m i n. 100 kΩ
1 -- 5 V/ m i n. 100 kΩ
Permitted input voltage for
voltage input (destruction
limit)
50 V continuous,
100 V for max. 1 ms
(sampling ratio 1:20)
Connection of signal
generators
• With voltage measuring
possible
Smoothing of measured
values
Yes, configurable in
4 stages by digital
filtering
Level
No
weak
medium
strong
Time constant
1 x cycle time
64 x cycle time
128 x cycle time
512 x cycle time
1)
DPV1 only
2)
Configuration error
Violation of lower limit value
Violation of upper limit value
Open circuit (1 to 5 V only)
Process interrupt lost