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What causes Unity Pro online error "The system cannot animate so many screens. Please close some of them."?

This is caused by the allocation of the bandwidth quota allocated to Unity Pro for selected communication mediums between the different functions available in online mode.
It can be corrected in the PLC – Set Address – Bandwidth window.
The default parameters are
"Animation support" = 70
"PLC Monitoring" = 10
"PLC Screen "= 10
"Diagnostic "= 10.

Please see the "Procedure for accessing bandwidths" section of the attached Unity Help document.

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