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User Data Areas for SIMATIC 505
13
User data areas are used for data exchange between the PLC and operating
unit.
These data areas are written to and read by the operating unit and the application program alternately during the process of communication. By analyzing
the data stored there, the PLC and operating unit reciprocally initiate predefined actions.
This chapter describes the function, layout and special features of the various
user data areas.
Communication for Windows-based Systems User’s Manual
Release 01/99
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