Fanuc Waiting For Startup [TOP]

| Cause Category | Specific Issue | |----------------|----------------| | | 24V DC dip during startup; aging capacitors in PSU | | Memory (SRAM) | SRAM parity error due to low battery (BAT1/BAT2) – most common | | Motherboard/Backplane | Loose connection or failing main CPU board | | PMC / Ladder | Corrupted PMC program or mismatched CNC/PMC software versions | | External Device | I/O Link device (e.g., remote I/O, handheld) not responding | | Firmware | Corrupt boot ROM or failed firmware update |

: If the software was recently updated or reloaded, it may be corrupted or incomplete. Motherboard/CPU Failure fanuc waiting for startup

Verify that internal circuit boards and memory modules are properly seated in the backplane. : Recovery requires either clearing SRAM with a valid

The "Waiting for Startup" condition is a issue, not a user programming error. Recovery requires either clearing SRAM with a valid backup or replacing the CPU board. Regular battery replacement and backups are the only effective long-term preventions. not a user programming error.