Sensor Supply Returned To Input Without Load; Sensor Supply Returned To Input With Load - Siemens SIMATIC ET 200C Manual

Mechanical and Electrical Installation
Wiring of ET 200C; DI 8
Return Sensor
The following must be noted if you feed the sensor supply of an input di-
Supply to Inputs rectly to an input ("Read back output" function):
Figure 4-4
Figure 4-5
4-14
DC 24V (6ES7 141-0BF00-0XB0), Continued
If no load is connected,
– the diagnostics for the sensor supply must be disconnected in the
COM ET 200 (see Section 5.1.4) or
– a resistor (2.4 k ) must be connected to ground at the input for
wire-break recognition.
Wire-Break Recognition with 2.4-k
Output

Sensor Supply Returned to Input without Load

If a load is connected, only a wire break on the connection to the load will
be recognized. The connection between the sensor supply and the input
cannot be monitored for wire breaks.
Wire-Break Recognition with Load
Output
Wire-Break Recognition not
Possible
Load

Sensor Supply Returned to Input with Load

Resistor
Input
2,4 k
Input
ET 200C Distributed I/O Station
EWA 4NEB 812 6119-02b