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11
Monitoring and Testing the Sequential
Control System
Using the Monitoring and Test Functions
The monitoring functions allow you to monitor and check a program while it is being
executed on the CPU.
This allows you to locate errors that were not indicated by the formal consistency
check while you were writing the program or by the syntax check performed during
compilation. These errors include the following:
• Programming errors, for example incorrectly set monitoring times in the
supervision conditions
• Logical errors in the program structure, in other words the program steps and
conditions do not match the actual process sequence you require.
Methods of Testing the Sequential Control System
S7-Graph provides you with a variety of methods with which you can test a
sequential control system. These methods can be divided into the following
classes:
• Monitoring the status information of the sequential control system
With this function, you can quickly obtain an overview of the way in which your
sequencers work.
• Controlling the sequencer
Apart from controlling the sequencer using the programmed FB call, S7-Graph
also provides a convenient dialog box for the test mode.
• Synchronization
Synchronization is an S7-Graph function with which the sequencer can be
matched to the process.
• Further test functions for monitoring the sequential control system
By calling STEP 7 functions from within S7-Graph, you can obtain more detailed
information about the entire process.
S7-GRAPH for S7-300/400 Programming Sequential Control Systems
C79000-G7076-C526-01
11-1
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