Siemens SIMATIC ET 200S Manual page 470

Analog Electronic Modules
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
Switching points
(TNF–5) _C
(TNF+5) _C
(TNF+15) _C
Measuring voltage
Voltage on the
PTC
13-86
Technical
specifications
On/reset
Max. 750 W
Off
From 1650W to 4000W
On/reset
From 1650W to 750W
Max. 550W
Min. 1330W
Min. 4000W
Max. 7.5 V
Remarks
Measured resistance < response
threshold
•
SIMATIC S7: bit 0 = "0" (in the PII)
•
SIMATIC S5: bit 3 = "0" (in the PII)
Temperature increase
Measured resistance > response
threshold
•
SIMATIC S7: bit 0 = "1" (in the PII)
•
SIMATIC S5: bit 3 = "1" (in the PII)
Temperature decrease
Measured resistance < response
threshold
•
SIMATIC S7: bit 0 = "0" (in the PII)
•
SIMATIC S5: bit 3 = "0" (in the PII)
TNF= rated operating temperature
ET 200S Distributed I/O System
EWA-4NEB780602402-09