
5-5
Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
5.2 Testing your Ladder Program - Overview
You can test your Ladder program by visually displaying the signal flow
within the network of a block. The display of the program is updated
cyclically.
You can only display the program status when the following conditions are
met:
S The block was saved and downloaded to the CPU without any errors.
S The CPU is in operation and the user program is running.
S You have opened the block online.
Figure 5-2 shows the basic procedure for monitoring the program status:
Open block online
Make settings for test display
Set trigger conditions
(optional)
Select test environment
Start/stop test
Figure 5-2 Procedure for Testing Logic Blocks in Ladder
Test Method
Prior Conditions
Basic Procedure
Editing the Block Properties and Testing the Program
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