I/O Module Part No :- 51304906-100 Assy No :- 51304907-100 Flame Sensor 4-02-133-1740 Q, I , C2 94V-0 This paddle board connects the Smart Peripheral Controller of a WDA History Module, the SPC card, with the Winchester Drive Interface of WDA History Module. It is physically connected to the WDI I/O paddle board using a waterfall ribbon cable.