Interrupt, Error And System Messages; Concept For Drivers And Diagnostic Blocks - Siemens SIMATIC ET 200PA SMART Operating Instructions Manual

Interrupt, error and system messages

8.1

Concept for Drivers and Diagnostic Blocks

Introduction
The I/O interfacing described below ensures high performance even for large project data
volumes. The configuration is fast and easy to execute.
Tasks of the driver and diagnostic blocks (driver blocks)
In process control systems, certain demands are placed on the diagnostics/signal processing.
This includes the monitoring of modules, DP/PA slaves and DP master systems 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, DP/PA slaves, and DP master systems 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). The tasks carried out by each of the different blocks
are identified in section "List of driver and diagnostic blocks".
Concept
The concept of the driver and diagnostic blocks for PCS 7 can be characterized as follows:
● The separation between user data processing (CHANNEL blocks) and diagnostic data
processing (MODULE blocks)
● The symbolic addressing of the I/O signals
● The automatic generation of the MODULE blocks by CFC
ET 200PA SMART
Operating Instructions, 06/2019, A5E34192013-AB
8
87