Snubbers are suppressors. They’ll be wired from each input to VC on the controller terminal strip. The print tells you where the PMI module is. Inside the triangle there is an O for Output or an I for Input, then the I/O name, then x-n where x=the PMI card number and n=the module number on that card. It’s best to confirm with the PMI chart or IMS. In IMS you should be using 16 bit ports and there are 48 PMI modules on each card so the first 3 columns are PMI 1, 4-6 are PMI 2, 7-9 are PMI 3 etc. first column is PMIs 1-16, 2nd column is PMIs 17-32, 3rd column is PMIs 33-48. Hope that makes sense. There should also be a chart in the controller door.