Siemens Simatic S7-1500 Manual - Page 15

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Siemens Simatic S7-1500 Manual
Resistor circuitry of the encoders
To detect a wire break, it is necessary that enough quiescent current is flowing even when
the encoder contacts are open. Connect a resistor of 25 kΩ to 45 kΩ with 0.25 W to the
encoder contacts for this reason.
Figure 3-2
Tip: Using the potential jumpers
If you want to supply both load groups with the same potential (non-isolated), use the
potential jumpers supplied with the front connector. This helps you to avoid having to
terminate two wires to one terminal.
Proceed as follows:
1. Connect the 24 V DC supply voltage to terminals 19 and 20.
2. Insert the potential jumpers between terminals 19 and 39 (xL+) and between terminals 20
and 40 (xM).
3. Use the terminals 39 and 40 to distribute the potential to the next module
Figure 3-3
Note
Ensure that the maximum current load of 8 A per potential jumper is not exceeded.
DI 32x24VDC HF digital input module (6ES7521-1BL00-0AB0)
Manual, 09/2016, A5E03485935-AF
Resistor circuitry of the encoders
Using the potential jumpers
Wiring
15