If the cycle time is very long the D23x-terminal is not able to execute the program properly.

If a program is slow (p.e 6 cycles/sec) the program on a D23x terminal won't work properly anymore. Changing pages can cause problems.

Solution:

To avoid this problem the HMI-editor has to be called more than usual.

In IL-programming: CPB S.HMI.PB_DRIVER

In Fupla-programming: Use the F-Box Call PC with the parameter S.HMI.PB_DRIVER

It depends on your project how often the PB has to be called.