Siemens SIMATIC ET 200S Manual page 493

Data for selection of the sensor
Input range (rated
value)/input resistance
•
Resistance
•
Resistive thermo-
meter
Use of Cu10 sensors
• Select "Thermal resistance 3-wire" and "Cu10" during configuration.
• Wire the Cu10 sensor in 3-wire connection technology
• During operation the wire resistance of the missing measuring wire is
automatically compensated internally.
Note
For optimum wire compensation with Cu10 please observe the following:
The total of wire resistance and measuring resistance must not exceed 31 Ω.
•
The resistance of the wire must be a maximum of 8 Ω if you want to use the
•
temperature range up to above 312 _C. Example: A 200 m long Cu cable with
a cross-section of 0.5 mm
allowable cable length accordingly.
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
150 Ω/min. 10 MΩ
300 Ω/min. 10 MΩ
600 Ω/min. 10 MΩ
3000 Ω/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
Cu10/min. 10 MΩ
2
has about 7 Ω, a small cross section reduces the
Analog Electronic Modules
Permitted continuous input
voltage (destruction limit)
Connection of signal
generators
•
For resistance
measuring
-- 2-wire connection
-- 3-wire connection
-- 4-wire connection
Characteristics linearization
Smoothing of measured
values
Level
weak
medium
strong
1)
As per VDE 0660 Part 302/303, Type A
Max. 9 V
Yes,
internal
compensation of
wire resistances
Yes
Yes, configurable for
Ptxxx, Nixxx
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
12-87