Greetings,
Since you are already using analog input channels 0-15, you will need to add another backplane to J11 to access channels 16-31. You are absolutely correct about J12 and J13 both being connected to analog input channels 0-13. So, in order to access the two analog output channels, you can add a 16-channel backplane to J13 and only use slots 14 and 15, which are connected to analog output channels 0 and 1, respectively. However, you can also use an 8-channel backplane to access these channels. The slots on the 8-channel backplanes have jumpers to select whether they are routed to the lower 8 channels or upper 8 channels. So, you would put your analog output modules in slots 6 and 7, and then you would set the jumpers such that these two slots are
routed to the upper 8 channels. I have included a couple of links you might find useful below:
How to Do Analog Output with an 8 Channel and 16 Channel 5B Backplane and an MIO BoardSC-205X Series User ManualGood luck with your application.
Spencer S.