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What does the error "Write Queue Overflow" mean on the Magelis HMI?
Issue:
The Magelis HMI is showing an error "Write Queue Overflow" at the bottom of the screen.

Product Line:
Magelis HMI programmed with Vijeo Designer (all versions), XBTG, XBTGT, XBTGK, HMISTU, HMISTO, HMIGTU, HMIGTO, HMIGK, iPC.

Resolution:
In Vijeo Designer, there is a write queue that can hold up to 100 write requests at any given time. If the PLC is too slow to process these write packets, the HMI will detect this and the error will be displayed on the HMI to inform that the writes are not making it to the PLC. Typical causes of this error are a slow baud rate and too many actions writing too often. Check if your periodic actions are running too fast for the PLC to catch up.

When the queue is full, the oldest write requests are thrown out as new ones come in.

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