Restrictions; Adapting The Program Status Display - Siemens SINUMERIK 828D Function Manual

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Restrictions

The advantage of displaying the status in the program editor is due to the fact that you obtain a graphic display of

the events in your program. However, not all of the tools are available as in the status chart (e.g. the function

"Single read", "Write all").

It is important that you know the restrictions of the program status if you test and monitor your program.

The color marking for "Signal flow" does not mean that there is always a signal flow!

In the program status in LAD, the values are only displayed at the end of the cycle. This means that it can be

sometimes difficult to evaluate just what the "signal flow" display really means. Boolean contacts and coils are

shown color coded in the program status in LAD corresponding to the value of the bit addresses. If the bit value

is 1 (bit is enabled), then the operation is marked in color. However, this does not necessarily mean that the

operation was actually executed. There are several conditions that can result in an unclear signal flow display:

If, when evaluating the status, the target system is in the STOP operating state, contacts can be activated,

however, coils and boxes are not switched-on because the program is not being executed.

If the program contains a jump operation, then it is possible that the networks that you are investigating, do

not display the expected results because the target system skipped these operations while executing the

It is a similar situation if you consider a subprogram. The boolean addresses can be activated, however, the

subprogram logic can only be executed if the subprogram is activated. If the subprogram was not called from

the main program, then no logic of the networks was executed regardless of what the bit values of the

operations display.

Status at the end of the cycle in LAD

If you display the program status in the program editor in LAD, the status is updated at the end of every cycle.

Displaying your program in another programming language has no effects at all on the actual program.

Adapting the program status display in the program editor

1. Select the menu command "Tools > Options".

2. Open the "Status" tab.

You can now edit the following settings:

Basic Functions

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

P4: PLC for SINUMERIK 828D

14.4 Test and diagnostic functions

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