Siemens SIMATIC S7-1500 Manual page 45

Connecting
3.1 Supply voltage X124
The following table shows the pin assignment of the 4-pin connector.
Table 3- 1
The 24 V supply is looped through via the 24 V connector. In the connector, pin 1 is
jumpered to pin 2 and pin 3 is jumpered to pin 4. The maximum current can be limited by the
current carrying capacity of the cable. The current carrying capacity of the cable depends on
the cabling method (e.g. in a cable duct, on a cable rack), among other things.
Select the permissible conductor cross-section in conformance with national rules (NEC,
VDE, etc.) from the following table "Interface X124". The basis for this can be the output
current of the 24 V DC supply or the overcurrent device used in the 24 V circuit. If the short-
circuit current of the utilized 24 V power supply unit is greater than 50 A, an appropriate
overcurrent device that limits the short-circuit current to this value must be used upstream of
the product.
Note
• The 24 V DC cable must be approved for temperatures of up to 75 °C.
• The maximum permissible cable length is 10 m.
44
Connector pin assignment for 24 V DC power supply
X124 Pin Signal name
1
2
3
4
Meaning
+ Power supply
+
M Ground
M
Equipment Manual, 11/2019, A5E46600370-AA
Technical specifications
24 V DC supply voltage (20.4
... 28.8 V)
Current consumption, max.:
13.1 A
SIMATIC Drive Controller