Hi Everybody, I'm using CQM1-CPU21-E with ID-211 input module, and two OC221 output modules. I'm considering to change both output modules to OD211 due to high relay failure at OC221. Does anyone know if program change needed in this case or does those output modules are drop-in compatible? Also. my load is inductive, do I need to consider parallel diode when switching to transistor output module? Appreciate your help. Michael.