Siemens SIMATIC ET 200S Manual page 13

Using PTC resistors
PTCs are suitable for temperature monitoring and as thermal protective devices for complex
drives and transformer windings.
● Select "Two-wire resistor" and "PTC" at parameter assignment:
● Connect the PTC in accordance with the two-wire connection method.
● Apply PTC resistors of Type A (PTC thermistors) in accordance with DIN / VDE 0660,
● If the diagnosis "Overrun/underrun" is enabled, a diagnosis "Lower limit exceeded"
● Sensor data for the PTC resistor:
Switching points
(TNF-5) °C
(TNF+5) °C
(TNF+15) °C
Measuring voltage
Voltage on the PTC
2AI RTD HF analog electronic module (6ES7134-4NB51-0AB0)
Manual, 05/2007, A5E01076876-02
Part 302.
indicating a short-circuit is indicated at resistance values < 18 Ω.
Properties
specifications
Behavior with rising temperature
< 550 Ω
550 Ω to 1650 Ω
> 1650 Ω
Behavior with falling temperature
> 750 Ω
750 Ω to 540 Ω
< 540 Ω
Max. 550 Ω
Min. 1330 kΩ
Min. 4000 kΩ
Max. 7.5 V
1.1 2AI RTD HF analog electronic module (6ES7134-4NB51-0AB0)
Technical
Normal range:
SIMATIC S7: Bit 0 = "0", Bit 2 = "0" (in the PII)
•
SIMATIC S5: Bit 3 = "0", Bit 5 = "0" (in the PII)
•
Prewarning range:
SIMATIC S7: Bit 0 = "0", Bit 2 = "1" (in the PII)
•
SIMATIC S5: Bit 3 = "0", Bit 5 = "1" (in the PII)
•
Addressable range:
SIMATIC S7: Bit 0 = "1", Bit 2 = "0" (in the PII)
•
SIMATIC S5: Bit 3 = "1", Bit 5 = "0" (in the PII)
•
Addressable range:
SIMATIC S7: Bit 0 = "1", Bit 2 = "0" (in the PII)
•
SIMATIC S5: Bit 3 = "1", Bit 5 = "0" (in the PII)
•
Prewarning range:
SIMATIC S7: Bit 0 = "0", Bit 2 = "1" (in the PII)
•
SIMATIC S5: Bit 3 = "0", Bit 5 = "1" (in the PII)
•
Normal range:
SIMATIC S7: Bit 0 = "0", Bit 2 = "0" (in the PII)
•
SIMATIC S5: Bit 3 = "0", Bit 5 = "0" (in the PII)
•
TNF= rated operating temperature
Properties
Remarks
13