Depending on processor module type, up to 3 option board slots are available. For each slot several option boards are available.

To add an option board on the processor module, select the desired OptionSlot to be configured and attach the needed option board from the list.
There is no limitation on the number of same option board used on the CPU.
Depending on the type of option board selected and attached to the CPU some further configuration of channels or function may be needed.