DIP switch settings:
By default, the DIP switches A and B are set to ON. Digital inputs are connected to a 12 Vā internal power supply:
DIP switch A is set to OFF, DIP switch B is set to ON. Digital inputs of the A group (ie. DI1 to DI3) are now ready for connection of an external power supply. Group B inputs are still powered by the 12 Vā internal supply.
This is possible also in reverse ā DIP switch A is set to ON, DIP switch B is set to OFF. Digital inputs of the A group are now powered by the internal 12 Vā source, group B inputs are ready for connection of an external power supply.
If both DIP switches A and B are set to OFF, digital inputs of both A and B groups (DI1 to DI6) are ready for connection of an external power supply: