7BCOMMUNICATION IN SIMATIC S7
8 Communication in SIMATIC S7
8.1 General information
SIWAREX U was developed for operation in SIMATIC S7.
In the SIMATIC Manager, SIWAREX U is configured like a function module (FM).
If SIWAREX U is missing in the module catalog of SIMATIC Manager (SIMATIC
Step 7 classic), the HSP from the CD of the configuration package must be read in.
As part of the configuration package, a project which is necessary for the operation
of SIWAREX U is delivered along with the standard software (FB 45 SIWA_U).
The program SIWAREX U "Getting Started" is also provided. This program shows
how application software can be created.
We recommend using the "Getting Started" program and expanding it for different
applications.
8.2 SIWAREX U in the HW-configuration
During the configuration of the hardware of the SIWAREX U module in the SIMATIC
Hardware Configuration, the basic characteristics of the module are laid down:
- The peripheral address of the module
- The diagnostic alarm enable/disable
- The process alarm enable/disable
- Peripheral communication I/O (for other automation systems) or data record
communication SFC/SFB/FB (for SIMATIC S7/PCS7).
SIWAREX U occupies 16 bytes in the input and output area.
After the selection of data record communication, several possibilities
are available:
- Communication by calling SFC 58/59
- Communication by calling SFB 52/53
- Reading the current weight values via the periphery (cyclical)
- Using the FB_SIWA_U in the "Getting started" project – recommended
The scale-specific parameters, which are also changed during the control program
runtime, can be defined in two ways:
- Using the SIWATOOL U set-up software
- Using the parameterization in the scale data block with subsequent transfer to
SIWAREX U. The cyclical communication between the SIWAREX U module
and the SIMATIC CPU is processed by the standard block FB SIWA_U (FB45).
SIWAREX U 8-51
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