Industrial 3-531-4221A Printed Circuit Board Assembly

Industrial 3-531-4221A Printed Circuit Board Assembly is a Cincinnati Milacron PC board designed as a PLC/add-on board for Milacron control systems. The part is cataloged under 3-531-4221A and is also listed as 3-533-0242G and 35314221A, with the MEM3 designation appearing in some listings. Verified retailer records describe it as a PLC/Add-On Board and note that it has been discontinued by the manufacturer, though surplus and used units may still be available from resellers. Availability in current catalogs is limited, reflecting its status as a legacy part. When sourcing, verify that the target Milacron controller family and I/O configuration are compatible with 3-531-4221A, and check that any required companion boards or firmware are present in the system.