Allen-Bradley D31771-1 Control Board

Allen-Bradley D31771-1 Control Board is a legacy CPU/control printed circuit board designed for older Allen-Bradley automation cabinets, serving as the central processing or interface module in compatible control systems. Verified identifiers include D31771-1, A26491A, 1100373821/80, and D317051, with reseller listings describing it as Stock Equipment’s PC Board/PLC Add-On Board. In procurement records for NTPC, it is listed as BOARD ASSY 196NT CPU #D31771-1, indicating its role as the CPU assembly for the 196NT family. Marketplaces show it as refurbished stock equipment, with cross-refs such as 1D31771 and the associated identifiers A26491A and 1100373821/80. As a legacy AB part, it is typically used to replace failed components in older installations rather than as a current production module, and compatibility depends on the specific backplane and controller era the unit was designed for, including the presence of the D317051 reference.