Siemens SIMATIC S5 Manual page 87

Connecting power units with 5...24 V optocoupler inputs
You must make the following jumper setting on the module:
jumper X30/4-6 inserted
jumper X31/1 -2 inserted (L-)
(see Fig. 3/6).
You must connect the power units as shown in
of power units with opto-coupler inputs to the connectors
Fig. 3/8 Connection
Pin assignment of the connectors for connecting power units (X4, X5, X6)
The pin assignment of the three connectors for axes 1 (X4), 2 (X5) and 3 (X6) is the same.
(US)
the voltage U must be supplied via connector x7/23, 24, 25
S
Fig. 3/8.
Operation
3-13