Siemens Simatic 620 Owner's Manual page 49

Connecting a PS/2 Keyboard
A PS/2 keyboard of your choice can be connected to the Box PC.
PS/2 keyboard connection
Figure 3-9 Connecting a PS/2 Keyboard
To connect the keyboard, proceed as follows:
1. Disconnect the Box PC from the power supply.
2. Insert the plug of the PS/2 keyboard.
3. Connect the Box PC to the power supply.
Note
It is recommended that a keyboard with straight keyboard connector is used, so
that the connector does not obscure adjacent ports.
SIMATIC Box PC 620 Manual
A5E00131465-01
Setting Up and Operating the SIMATIC Box PC 620
3-15