Siemens Metro 21 M216KA Operator's Manual page 293

Analog value formation
Measurement principle
Conversion time/resolution per
channel
Parameterized
Time constant of the input
filter
Conversion time in ms
Resolution (incl. overrange/
representation in two's com-
plement)
– 4...20 mA
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
EWA 4NEB 780 6009-02c
SC Analog Electronic Modules – T echnical Data
instantaneous value Input ranges (rated values)/input
encoding resistance
Permitted input current
For current input
no
(destruction limit)
typ. 1 ms
Connection of sensors
1
For current measurement
–
–
12 bits
Characteristic curve linearization
Temperature compensation
Smoothing of measured values
Sensor Selection Data
4...20 mA/approx.
50
35 mA, permanent;
150mA for max. 1s;
(pulse duty factor
1:20)
As 2-wire measuring possible
transducer
Load of the 2-wire mea- up to 750
suring transducer
no
no
yes; set by parame-
ters in 4 steps by
digital filtering
Step Time constant
None 1x cycle time
Weak 8x cycle time
Medium 64x cycle time
Strong 128x cycle time
12-37