Keyread V20 Mitsubishi

KeyRead V2.0 Mitsubishi (often referred to as FX_KeyReader) is a specialized software utility used by industrial technicians to unlock and crack passwords for Mitsubishi Programmable Logic Controllers (PLCs). Overview of Functions

The software is primarily designed for legacy and entry-level Mitsubishi hardware. Its main capabilities include: Password Retrieval:

It allows users to read or bypass the keyword (password) on older Mitsubishi FX series PLCs, such as the FX1S, FX2N, and FX1N Access Recovery: keyread v20 mitsubishi

It is used in scenarios where original project documentation is lost or when a technician needs to perform maintenance on a locked controller. Compatibility Limits:

While V2.0 works effectively on older series, users have noted that newer models (like FX3U, FX3G, and FX3S) often require additional paid modules or updated versions to unlock. User Sentiment & Performance Reliability: Users on technical forums and KeyRead V2

generally report that the tool is "100% effective" for the specific older models it supports. Ease of Use:

The interface is considered lightweight and straightforward, focusing solely on the "Read Keyword" function rather than being a full programming suite like GX Developer Ethical Consideration: Hardware & Software Requirements To deploy KeyRead V20

This paper is intended for maintenance technicians, controls engineers, and system integrators who encounter legacy systems protected by KeyRead V20.

Hardware & Software Requirements

To deploy KeyRead V20 with Mitsubishi, you need:

• KeyRead V20 Base Station – A DIN-rail mountable module (model KR20-MT) that connects via USB or RS-485 to the Mitsubishi PLC’s programming port.
• V20-Compatible Keys – Available as Type A (USB dongle) or Type B (microSD card with encrypted chip).
• Mitsubishi Firmware v7.20+ for the target CPU module. Older CPUs require a firmware upgrade.
• KeyRead V20 Configuration Tool (standalone Windows app) to map key IDs to specific Mitsubishi data registers (e.g., D1000 for key status, D1002 for remaining cycles).

4.2 Software Setup

1. Run KeyRead_V20.exe as Administrator.
2. Select Mitsubishi from the vendor dropdown.
3. Choose the correct COM port (e.g., COM3). Verify in Windows Device Manager.
4. Set communication parameters:
   • Protocol: MELSEC Programming Protocol
   • Baud rate: 9600 (default for FX) or 19200 (Q series)
5. Click Connect. The status bar should show “PLC Online – Waiting.”

Step 5: Testing

Engineer A inserts their USB dongle. Within 0.5 seconds, D500 becomes 1, D501=101, D502=2. The HMI now shows “Maintenance Mode – Level 2”. Removing the key instantly writes D500=0, locking all critical coils.