Siemens ET 200S Manual page 467

Data for Selecting a Sensor
Input range (rated
value)/input resistance
S
Resistance-type sensor
S
Resistance
thermometer
Permitted input voltage
(destruction limit)
Use of Cu10 Sensors
S Select "Three-conductor thermal resistor " and "Cu10" at parameter
assignment.
S Wire the Cu10 sensor in accordance with the three-conductor connection
method.
S Automatic, internal compensation of line resistance for the missing measuring
line occurs during operation.
Note
Please note the following to ensure optimum line compensation in the case of
Cu10:
S
The sum of the cable resistance and measurement resistance must not exceed
31Ω.
S
The cable must have a resistance of no more than 8Ω if you want to use the
temperature range up to and above 312_C. Example: A 200 m Cu cable with a
0.5 mm
cross-section shortens the permissible cable length accordingly.
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
150 Ω/min. 10 MΩ
300 Ω/min. 10 MΩ
600 Ω/min. 10 MΩ
3000Ω/min. 10 MΩ
PTC min 10 MΩ
Pt100/min. 10 MΩ
Ni100/min. 10 MΩ
Ni120/min. 10 MΩ
Pt200/min. 10 MΩ
Ni200/min. 10 MΩ
Pt500/min. 10 MΩ
Ni500/min. 10 MΩ
Pt1000/min. 10 MΩ
Ni1000/min. 10 MΩ
Max. 9 V
2
conductor cross-section has approximately 7Ω. A smaller
Analog Electronic Modules
Connection of the sensors
S
For resistance
measurement
– Two-conductor
connection
– Three-conductor
connection
– Four-conductor
connection
Characteristic curve lineari-
zation
Smoothing of the measured
values
Step
None
Weak
Medium
Strong
1
In accordance with VDE 0660 Part 302/303, Type A
Yes
Yes, internal
compensation of line
resistances
Yes
Yes, parameteriza-
ble for Ptxxx, Nixxx
Yes, parameteriza-
ble in 4 steps by
means of digital filte-
ring
Time constant
1 x cycle time
4 x cycle time
32 x cycle time
64 x cycle time
12-111