Analog Electronic Modules
12-112
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
Use of PTC Resistors
PTCs are suitable for temperature monitoring and as thermal protective devices for
complex drives and transformer windings.
Select “Two-conductor resistor” and “PTC” at parameter assignment:
Connect the PTC in accordance with the two-conductor connection method.
Apply PTC resistors of type A (PTC thermistors) in accordance with DIN /
VDE 0660, Part 302.
Sensor data for the PTC resistor:
Feature Technical
specifications
Remarks
Switching points On/reset
Max. 750 Ω
Measured resistance < response
threshold
SIMATIC S7: bit 0 = “0” (in the PII)
SIMATIC S5: bit 3 = “0” (in the PII)
Off
From 1650Ω to 4000Ω
Temperature increase
Measured resistance > response
threshold
SIMATIC S7: bit 0 = “1” (in the PII)
SIMATIC S5: bit 3 = “1” (in the PII)
On/reset
From 1650Ω to 750Ω
Temperature decrease
Measured resistance < response
threshold
SIMATIC S7: bit 0 = “0” (in the PII)
SIMATIC S5: bit 3 = “0” (in the PII)
(TNF–5) C
(TNF+5) C
(TNF+15) C
Measuring voltage
Voltage on the
PTC
Max. 550Ω
Min. 1330Ω
Min. 4000Ω
Max. 7.5 V
TNF= rated operating temperature
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