Siemens NAN 67 Series Manual de Serviço descarregar pdf (Página 70)

5-8

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

C79000-G7076-C504-02

5.5 Choosing a Test Environment and Starting/Stopping the Program

Status

There are two ways of testing your program online.

S The “process” test environment tests your program online, in a working

process. The status of the statements in programmed loops that are run

through more than once in the scan cycle is stopped at the return jump to

the start of the loop and is no longer updated while the loop is visible.

This mode causes the least load on the cycle.

S In the test environment “laboratory” your program is also tested online

under laboratory conditions. In this case, however, the status of

statements in programmed loops that are run through more than once in

the scan cycle is shown after the end of each loop. This mode can take up

considerable scan time depending on the number of loop iterations and

the number of tested statements.

You can select the test environment using the menu command Debug

Test

Environment

Laboratory/Process.

The program status is started and stopped by using the command Debug

Monitor. The program status is only displayed for the area currently visible

in the editor.

FB6-<Online>

Network 1

Network 2: Green for road traffic

#starter

#condition

#condition #g car

#t_next_red_car #t_dur_r_car

Network 3: Start duration of yellow for road traffic

#condition

FB6 : Traffic Light

#t_dur_y_car

S5T#3S

Address Decl. Symbol Data Type Initial Value Comment

dur_g_p

del_r_p

starter

S5TIME

BOOL

S5T#0MS

FALSE

0.0

2.0

4.0

Figure 5-5 Program Status in Ladder (Example)

Selecting a Test

Environment

Starting and

Stopping the

Program Status

Editing the Block Properties and Testing the Program

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 317 318

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