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Configuring
4.5.3 Automatic mode: Communications
4.5.3.1 Application with an S7 control and SIMATIC FM 458 application
module
The following prerequisites must be fulfilled in order to successfully
Transferring
transfer tables:
tabular values
• The function blocks TAB and/or TAB_D must be configured in the
• The X and Y values of a table in a DB must always be present
In order to start data transfer, inputs REQTAB and REQDB at
WR_TAB must be set to 1. The tabular values of the DB, specified at
input DBNUM at WR_TAB can then be transferred.
The actual number of transferred data blocks is always displayed at the
CNTTEL output of the WR_TAB.
The number of data blocks is displayed at the TABTEL output of the
WR_TAB, which is required until the complete contents of the DB are
transferred to the SIMATIC FM 458 application module.
If the tabular values have been completely entered in the specified DB, or
if it involves the last partial transfer of a table (sub-set of a table), which
does not "fit" completely into a DB, then before starting the transfer, input
LASTDB of the WR_TAB should be set to 1. This means that the
SIMATIC FM 458 application module is signaled at the end of the data
transfer. The STATUS output of the WR_TAB then changes from 2 to 0.
All of the tabular values, which are located in the DB, specified at the
NOTE
DBNUM input of the WR_TAB, are always transferred.
If the table is too large for a data block, then the tabular values are split-
Table too large for
up into individual sub-sets for transfer. The procedure is as follows:
a DB
To start, the first table section is written into the DB and is then
transferred as described above. The LASTDB input of the WR_TAB
remains at 0. The STATUS output of WR_TAB stays at 2 during data
transfer and then changes, at the end of the table sub-set transfer (partial
transfer) from 2 to 1.
4-40
FM 458 application module corresponding to the configuring
specifications for "Automatic mode: Communications" (A detailed
explanation is provided in Section "Configuring for S7 control and
SIMATIC FM 458 application module").
alternating. There must be a Y value for each X value, so that the
number of values in a data set is always an integer number.
Application Module FM 458 - User Manual
6DD1904-0AE0
Edition 12.2001
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