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5-7

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

5.4 Setting the Trigger Conditions

By setting the trigger condition you select the call environment of the block

to be tested. The test will not take place unless the trigger condition is

fulfilled.

The trigger conditions can be set by using the menu command Debug

Call

Environment.

Block Call Environment

Cancel

Trigger Condition

OK Help

No Condition

all Path 1st Block:

nd Block:

rd Block:

Block Status: FB6

Open Data Blocks

lobal DB Number: DB6

nstance DB Number:

Figure 5-4 Setting the Trigger Conditions

The three possible settings have the following meanings:

S No trigger conditions: The call environment of the block being tested is

irrelevant. This means that if a block is called at various points during the

program, you will not be able to distinguish which status applied to which

call.

S Call path: This is the call path used for calling the block in order to

trigger a status display. You can enter three block nesting levels before the

tested block is reached.

S Open data blocks: In this case the call environment is defined by one or

two data blocks. A status display is triggered when the block currently

being tested is called in association with one of these data blocks.

Background

Procedure

Trigger Condition

Settings and their

Meanings

Editing the Block Properties and Testing the Program

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Siemens NAN 67 Series Manual de servicio Pagina 69