Configuring
4-66 Application Module FM 458-1 DP - User Manual
A5E01078222-02 Edition 03.2009
After a table has been transferred, the inactive table, in which transferred
data are located, is activated and all table values are copied into the new,
inactive table so that both tables have the same contents. This can take
some time depending on the size of the table.
4.7.3.2 Configuring for S7 control and SIMATIC FM 458-1 DP application
module
The following function blocks must be configured for the coupling
between an S7 control and an SIMATIC FM 458-1 DP application module
via P bus:
SIMATIC FM 458-1 DP application module:
TAB (for REAL data type) and/or
TAB_D (data type DINT)
@CPB (P-bus coupling, central block)
S7 control:
WR_TAB
Each table may only contain values associated with one particular data
type. If several tables with different data types are to be managed, then
an TAB or TAB_D must be configured for each table.
WR_TAB is used to transfer the tabular values from SIMATIC DB to
function blocks TAB and TAB_D. The tabular values are transferred
using a data telegram. When the last data telegram has been transferred,
the TAB or TAB_D is automatically signaled that all of the tabular values
have been transferred and that the table should be activated. WR_TAB
receives a checkback signal as to whether activation was successful or
not. After the table was successfully activated, its address is output at the
TAB output of the TAB or TAB_D.
The usual restritions regarding P bus communications apply for
communications between WR_TAB and TAB / TAB_D:
WR_TAB input RECNUM: 2<= RECNUM<=127
FB TAB, FB TAB_D: Mode, only refresh
FB TAB, FB TAB_D: Channel name (TAB) max. 6 characters
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