YASKAWA JANCD-PC51 Introduction
The YASKAWA JANCD-PC51 is a high-performance Position Control Board (also classified as a Peripheral Control or Sequence Control Board)
designed for the YASNAC J50 series CNC systems and certain specialized Motoman robot controllers (such as the ERC series).
Its primary role is to bridge the gap between the main CPU and the machine’s physical hardware.
It handles the high-speed processing of I/O signals, sequence control (PLC functions), and specific position-related feedback that requires faster response times than the standard system bus can provide.
Technical Parameter Table
| Parameter | Specification |
| Manufacturer | Yaskawa Electric Corporation |
| Model Number | JANCD-PC51 |
| Compatible Systems | YASNAC J50L, J50M, ERC Robot Controllers |
| Function | Sequence Control / Position Interface / I/O Logic |
| Installation | Backplane Plug-in (compatible with JANCD-BB50 series) |
| Internal Voltage | +5V DC, +12V DC (via backplane) |
| I/O Capacity | Managed via external interface connectors |
| Dimensions | Standard Yaskawa PCB (approx. 230mm x 180mm) |
| Weight | Approx. 0.38 kg |
Product Advantages and Features
High-Speed Logic Execution: Dedicated to handling the “Sequence” (PLC) part of the machine control, freeing up the main CPU for complex path calculations.
Stable Signal Processing: Features robust noise filtering for digital inputs/outputs, critical for reliability in high-voltage industrial environments.
JANCD-PC51
Modular Interface: Allows for the expansion of the machine’s peripheral control without needing to overhaul the entire CNC architecture.
JANCD-PC51
Direct Hardware Handshaking: Capable of managing fast-response signals like emergency stops, limit switches, and tool-change interlocks directly.
Legacy Support: Provides a reliable replacement path for aging YASNAC J50 systems still in operation in high-precision workshops.
Application Cases
CNC Milling (J50M): Managing the tool changer (ATC) logic and spindle orientation sequences.
CNC Turning (J50L): Controlling turret indexing, hydraulic chucking, and tailstock movements.
ERC Robot Systems: Acting as the primary interface for external machine synchronization (handshaking with conveyors or presses).
Retrofitting: Used as a core component in restoring older high-end Japanese machine tools (e.g., Mori Seiki, Matsuura) to original factory specs.
Related Models & Other Models in the Same Series
The JANCD-PC51 is typically installed alongside other boards in the J50 control rack:
| Model | Function / Description |
| JANCD-CP50B | Main CPU Board (The “Brain” that works with the PC51) |
| JANCD-PC51B | Revised version of the PC51 with improved logic density |
| JANCD-IF50 | General Interface Board for external communication |
| JANCD-MM51 | Memory Extension Board for part program storage |
| JANCD-SR51 | Servo Interface Board for axis command/feedback |
Troubleshooting Tip: “Sequence Error” or “I/O Fail”
If your YASNAC system powers on but fails to “Ready Up” or shows a PLC/Sequence alarm, the JANCD-PC51 is often the component responsible for those logic gates.
Before replacing it, ensure the connection to the JANCD-IF50 interface board is clean and secure.
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