Cincinnati Milacron 3-531-3674A Tape Reader Interface Circuit Board

The 3-531-3674A is a tape reader interface board designed for Cincinnati Milacron CNC systems, enabling communication between legacy tape reader units and the CNC control architecture. It handles the signal conversion and timing necessary for reading punched tape input used in early NC/CNC programming.

Model Number: 3-531-3674A
Function: Tape reader communication and interface control
Compatibility: Cincinnati Milacron CNC systems (Acramatic 850/900, Big Blue, CMM series)
Board Type: Multilayer PCB with digital logic and timing components
Interface: Connects to RS-232 or parallel-type tape reader ports
Connectors: Edge-mounted gold-finger connector for rack backplane; auxiliary connectors for reader cabling
Status Indicators: On-board LEDs for data read/transfer indication
Data Handling: Buffers and transmits tape reader input to CNC processor
Dimensions: Approx. 150 mm × 100 mm
Weight: Approx. 1 lb (0.45 kg)
Power Source: Supplied via CNC backplane
Construction: FR4 PCB with discrete logic ICs, timing circuits, and noise filtering
Mounting: Chassis rack slot, typically in I/O or reader interface bay
Application: Legacy CNC program loading from punched tape in maintenance or retrofit scenarios Please review pictures carefully and let us know if you have any questions!