Siemens Simantic ET 200S - Page 213

Analog electronic modules
4.16 2AI RTD High Feature analog electronic module (6ES7134-4NB51-0AB0)
ET 200S
Manual, Edition 10/2005, A5E00514527-01
4-83
Note
Please note the following to ensure optimum line compensation in the case of Cu10:
• The sum of the cable resistance and measurement resistance must not exceed 31 Ω.
• The cable must have a resistance of no more than 8 Ω 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
2
conductor cross-section has
approximately 7 Ω. A smaller cross-section shortens the permissible cable length
accordingly.
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,
Part 302.
• Sensor data for the PTC resistor:
Features Technical
Specifications
Remarks
Behavior with rising temperature
< 550Ω Normal range:
• SIMATIC S7: Bit 0 = "0", Bit 2 = "0" (in the PII)
• SIMATIC S5: Bit 3 = "0", Bit 5 = "0" (in the PII)
550Ω to 1650Ω Prewarning range:
• SIMATIC S7: Bit 0 = "0", Bit 2 = "1" (in the PII)
• SIMATIC S5: Bit 3 = "0", Bit 5 = "1" (in the PII)
> 1650Ω Addressable range:
• SIMATIC S7: Bit 0 = "1", Bit 2 = "0" (in the PII)
• SIMATIC S5: Bit 3 = "1", Bit 5 = "0" (in the PII)
Behavior with rising temperature
> 750Ω Addressable range:
• SIMATIC S7: Bit 0 = "1", Bit 2 = "0" (in the PII)
• SIMATIC S5: Bit 3 = "1", Bit 5 = "0" (in the PII)
750Ω to 540Ω Prewarning range:
• SIMATIC S7: Bit 0 = "0", Bit 2 = "1" (in the PII)
• SIMATIC S5: Bit 3 = "0", Bit 5 = "1" (in the PII)
Switching points
< 540Ω 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-5) °C
(TNF+5) °C
(TNF+15) °C
Measuring voltage
Voltage on the PTC
max. 550 Ω
min. 1330 Ω
min. 4000 Ω
max. 7.5V
TNF= rated operating temperature