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What does the error "Write Queue Overflow" mean on the Magelis HMI?

Published date: 21 February 2019

Issue:
What does the error "Write Queue Overflow" mean on the Magelis HMI?

Product Line:
Magelis HMI programmed with Vijeo Designer (all versions)

Resolution:
In Vijeo Designer, there is a write queue that can hold up to 100 write requests. If the PLC is too slow to process these write packets, 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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