Clarification on documentation which does not indicate the addition of an xPDI8 and an xPDO4 being a valid combination to add to a b3 or i2 controller.
xP modules xPDI8 xPDO4
An addition to a existing i2 controller with an expansion port requires (4) more digital outputs and (8) more digital inputs. However, the documentation does not list the combination of the xPDO4 and xPDI8 as valid.
That combination of expansion modules is not a tested, valid combination. The only tested combinations are those in the attached pages from the i2 Technical Reference