MELSECNET/H Error Code F222H Technical Bulletin

This technical bulletin explains that error code F222H occurs in MELSECNET/H network systems when the network route in GX Developer is mistakenly set to C24 or CC-Link, causing the module to broadcast requests to all stations and resulting in congestion, delayed tasks, and access failures. It provides system restoration procedures (power cycling all PLCs) and notes that modules with serial number 05102 or later have been improved to return an error response instead of causing network disruption.