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A.9
Drivers, parameters, diagnostic messages and address space
A.9.1
Concept of the driver and diagnostics blocks in PCS 7
Use with PCS 7
The following information shows you the benefits of using PCS 7. PCS 7 automatically carries
out many important parameterizations and interconnections of blocks.
If you want to use the CFU outside of the PCS 7 environment, note the subsequent section.
Tasks of the driver and diagnostics blocks (driver blocks)
In process control systems, certain demands are placed on the diagnostics/signal processing.
This includes the monitoring of modules, IO devices and IO controllers for malfunctions and
failures.
To enable this, blocks are available in the PCS 7 library that implement the interface to the
hardware including test functions.
These blocks perform two basic tasks:
● They provide signals from the process to the AS for further processing.
● They monitor modules, IO devices and IO controllers for failure.
When the process signals are read in, these blocks access the process image input (or process
image partition) (PII) and when the process signals are output, they access the process image
output (or process image partition) (PIQ).
Concept
The concept of the driver and diagnostics blocks for PCS 7 can be characterized as follows:
● The separation between user data processing (CHANNEL blocks) and diagnostics data
processing (MODULE blocks)
● The symbolic addressing of the I/O signals
● The automatic generation of the MODULE blocks by CFC
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD
A.9 Drivers, parameters, diagnostic messages and address space
Appendix
193
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