Siemens Simatic S7-1500

The following table shows the pin assignment of the 4-pin connector.
Table 4-1Connector pin assignment for 24V DC power supply
X124 Pin Signal name Meaning Technical specifications
1 +
2 +
Power supply
3 M




4 M
Ground
24VDC supply voltage (20.4 …
28.8V)
Current consumption, max.:
13.1A
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.
Characteristics of the X124 interface
Table 4-2Interface X124
Properties Version
Connector type 4-pin screw-type terminal
Number of connectable conductors 1
Connectable conductor types and conductor cross-
sections
Solid 0.2mm²… 2.5mm²
Flexible 0.2mm²… 2.5mm²
Flexible with wire-end ferrule without plastic
sleeve
0.2mm²… 2.5mm²
Flexible with wire-end ferrule with plastic
sleeve
0.2mm²… 1.5mm²
AWG/ kcmil 22…12
Stripped length 6… 7mm
Tool Screwdriver 0.5x 3mm (M2.5)
Tightening torque 0.4 to 0.5Nm (3.5 to 4.4 lbf in)
1)
This value must be ensured for the current carrying capacity of the power cable.
44
SIMATIC Drive Controller
Equipment Manual, 11/2022, A5E46600370-AC
Connecting
4.1 Supply voltage X124