Siemens SIMATIC ET 200SP Manual page 19

Parameters/address space
4.1 Measurement types and measuring ranges
Special features when using Cu10 sensors
● Choose "Thermal resistor (3-wire connection)" and "Cu10" in the parameter assignment.
● Wire the Cu10 sensor into the 3-wire connection technology.
● During operation, automatic, internal compensation of the line resistance of the missing
measuring line takes place.
Note
To ensure optimum line compensation with Cu10, please observe the following:
• An accurate measured value is only attained if the cable resistance of the positive
• Recommendation: Keep the measuring line as short as possible.
• Different resistance values may also occur due to the connection method used.
Special features when using PTC resistors
PTCs are suitable for monitoring temperature and/or as thermal protection devices of
complex drives or transformer windings.
● Choose "Thermal resistor (2-wire)" and "PTC" in the parameter assignment.
● Connect the PTC to the 2-wire connection technology.
● Use the PTC resistors, type A (PTC thermistor) in accordance with DIN/VDE 0660,
part 302.
● If "Underflow" diagnostic is enabled, a "Low limit violated" diagnostic is generated for
resistance values < 18 Ω, indicating a short-circuit.
● Sensor data for the PTC resistor:
18
constant current line to the Cu10 sensor and the cable resistance of the negative
measuring line are identical in value.
Analog input module AI 4xRTD/TC 2-/3-/4-wire HF (6ES7134-6JD00-0CA1)
Manual, 09/2018, A5E03573289-AE