Table of Contents
Advertisement
Scale parameters and functions
8.11 DR 14 SIMATIC interface parameters
8.11.1
Selection of process value 1, 2
The current process values can be read 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 FB 41 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
Process value
No process selected
Gross process
Net process
Tare process
Legal trade G/N weight
G/N weight_x10
Unfiltered digit value
Filtered digit value
Refresh counter
Async. error bits (32 bits):
Bits 0..15: operator error
Bits 16..31: technology error
72
Selection table for process value 1,2
Decimal code
From DR
0
-
1
30
2
30
3
30
4
30
5
30
9
31
10
31
12
30
15
32
Format
-
FLOAT
FLOAT
FLOAT
FLOAT
FLOAT
LONG
LONG
USHORT
LONG
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
Advertisement
Table of Contents
