
Functions of the IM 151-7 CPU
8-24
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Measured value archives
Measured values are created when the user program is processed by the
IM 151-7 CPU. These measured values are to be archived and evaluated.
Processing sequence of a measured value archive
Collecting the measured values:
The measured values in the working memory are collected in a DB (for
alternating buffer operation in several DBs) by the IM 151-7 CPU.
Archiving the measured values:
Calling the SFC 84 ”WRIT_DBL” from the user program moves the measured
values in the DB to the load memory before the data volume can exceed the
memory capacity of the working memory.
Load memory
(MMC)
Measured values 1
Measured values 2
:
Measured values n
Working memory
(IM 151-7 CPU)
Current
measured values
SFC 82
CREA_DBL
SFC 84
WRIT_DBL
Figure 8-7 Handling measured value archives
Calling the SFC 82 ”CREA_DBL” from the user program generates new
(additional) DBs as non-process-related DBs in the load memory. These
non-process-related DBs do not require space in the working memory.
Note
If a DB with the same name already exists in the load memory and/or working
memory, the SFC 82 is terminated and an error display is generated.
The data written to the load memory is not erased by a memory reset and is
transferrable.
Evaluating the measured values:
The measured value data blocks stored in the load memory can be uploaded
and evaluated by other communication partners (e.g. PD, PC, ...).
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