Table 8-8 Assignment of data record 14
Variable Note Type L Rw Default Min. Max.
Data record
number
Contains no.
of data record
UINT 2 r 14 - -
Length Data record
length infor‐
mation
UINT 2 r 16 - -
Application Information
on which ap‐
plication the
DR belongs
to
UINT 2 r 201 - -
Version iden‐
tifier
Information
on the cur‐
rent data re‐
cord version
UINT 2 r 1 1 65 635
Selection of
process val‐
ue 1, 2
(Page 82)
Code for the
selection of
the process
variable to be
updated
UINT 2 rw 4 0 10
Selection of
process val‐
ue 1, 2
(Page 82)
Code for the
selection of
the process
variable to be
updated
UINT 2 rw 3 0 10
Reserve 1 Reserve INT 2 rw 0 0 -
Reserve 2 Reserve UINT 2 rw 0 0 -
8.12.1 Selection of process value 1, 2
Read the current process values to the SIMATIC CPU with the DR 30 and DR 31 data records
and the FB SIWA function block. The transfer of a larger data record is based on "acyclic
services". It may take several SIMATIC CPU cycles and therefore have a negative effect on
system performance.
The I/O interface of the SIWAREX module is the best option if a process value is to be rapidly
transferred to the SIMATIC CPU as soon as it is created in the SIWAREX module. Data is
applied cyclically by FB321 and provided as a tag in the scales data block.
The relevant code from the table below must be entered to define the tag for output via the I/O
interface.
Table 8-9 Selection table for process value 1,2
Process value Decimal code From DR Format
No process selected 0 - -
Gross process (after low-pass filter 1) 1 30 REAL
Net process (after low-pass filter 1) 2 30 REAL
Tare process 3 30 REAL
Scale parameters and functions
8.12 DR 14 SIMATIC interface parameters
SIWAREX WP321
82 Operating Instructions, 08/2019, A5E33715669A-AD
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