Process data area
The structure of the peripheral areas for the EasyProfibus is as follows:
3 permanently allocated words
+ fault message area
+ variable area
Structure in detail:
The full length and thus the number of possible fault messages and variables of the existing peripheral area depends on the number (length) of words defined in the DP slave.
The more words have been defined, the more fault messages and / or variables (up to the maximum limit) can be used. Please note, however, that the more words have been defined / are being used, the longer the refresh of pages and the updating of variables will take.
The same applies to the number of dynamic objects on a page: the more there are, the slower the page refresh and the variable update.
Since the variable area is located after the fault message area, the maximum possible number of variables (as well as the defined word length of the DP slave participant) is defined by the fault message area.
The more fault messages have been defined, the fewer variables can be used.
The maximum number of variables is 55 words, provided no fault messages are being used.