Siemens SIMATIC NET PROFIBUS Instrukcja Obsługi Strona 147

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Description of the DP Functions, Data, and Error Codes
DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-01
147
Reading without Consistency
To read without consistency, the locking and release of the data area are simply
omitted.
General Notes
!
Warning
The lock is canceled by the following:
Locking a different slave to read its input data (Section 4.3.1)
Locking a different slave to read its diagnostic information
Triggering a job to write the output data of a slave using the corresponding
control register (Section 4.3.3)
Note 1
The data is only valid when the master is in the STOP, OPERATE, or CLEAR/
AUTOCLEAR mode and the slave is configured in the current database.
Note 2
The memory area with index 127 contains the data of the slave module of the
CP 5614.
Note 3
Based on the diagnostic counter, you can recognize whether or not new diagnostic
data have been received. The diagnostic counter is incremented each time a
diagnostic message is received.
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