EZD Program cycle
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COM-LINK data access during the program cycle
The data exchange with the point-to-point connection can be
carried out in any segment of the program cycle. This data
exchange increases the cycle time with both active and
remote stations. Only use data that is absolutely necessary.
Loading visualization data
When setting a program to RUN that contains visualization
data, the contents of the screens to be displayed have to be
loaded.
The time required for loading in the event of a screen change
depends on the size of the screens to be loaded. During a
screen change, the new screen is loaded from the screen
memory into the RAM. Every 200 ms EZD checks whether a
new screen has to be loaded.
The loading time can be calculated as follows:
screen size in byte multiplied by 80 µs.
Example:
Screen size 250 bytes:
The loading time for the screen is: 250
×
80 µs = 20 ms
The loading of screen data and screen changes can be
implemented in any segment of the program cycle. Take this
behavior into account when considering the reaction time of
your entire control system.
J
If you require the EZD to have a small cycle time:
use several small screens so that the loading time is not too
long during a screen change. Only display necessary
information in the screens concerned (
J
Distribute tasks among several devices in the EZ-NET.
EZ800 for open and closed-loop control functions, EZD for
display and operator functions.
