Flash Read Error

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An error was detected while the Safety PLC attempted to read data from its internal flash memory. This often indicates corruption of the stored firmware, configuration, or boot project, or a hardware defect in the flash memory itself. This can prevent the PLC from booting up, loading its program, or maintaining persistent data, risking system failure.

• Corruption of the stored firmware image, boot project, or configuration data in the internal flash memory.
• Hardware defect of the flash memory chip itself within the safety PLC.
• Power supply interruption or instability during a flash write operation, leading to data corruption.
• Excessive write cycles to the flash memory (less common in PLCs but possible with frequent logging/updates) causing wear.

Klikk på steg for å spore fremgangen.

1. 1

   Perform a power cycle of the safety PLC by removing and reapplying the 24VDC supply voltage at terminals L+ and M.

2. 2

   Attempt to re-download the safety PLC's firmware image using the appropriate manufacturer's tool (e.g., TIA Portal Firmware Update tool).

3. 3

   Execute a full memory reset (e.g., "MRES") on the safety PLC to clear any corrupted data, then attempt to download the entire safety project.

4. 4

   Verify the stability of the 24VDC power supply to the safety PLC, checking for voltage fluctuations or drops.

5. 5

   If an SD card is used for boot-up or firmware, replace it with a new, tested card and re-download relevant files.

6. 6

   Replace the safety PLC CPU module if the flash read error persists after attempting firmware re-download and memory reset.