Duelco DSC-MA4Product ID: 1103425DSC-MA4 is an 4 analogue inputs Expansion Unit.PDF files: Duelco Safety Controller manualDuelco DSC-CSU manualDuelco DSC-Expans modules manualDuelco DSC-Fieldbus manualDuelco DSC-MCM manualDuelco DSC-MCT manualDuelco DSC-MSC manualDuelco DSC-MV manual