Status Update; Simulating Process Conditions; Checking Cross References And The Elements Used - Siemens SINUMERIK 828D Function Manual

14.4.1.5

Status update

Program status in LAD
If you monitor the program status in the program editor in LAD, the status is updated at the end of each cycle. If
an address is processed by several operations, the intermediate values of the addresses are not displayed by the
status. Only the values of the addresses at the end of each program cycle are displayed in the LAD program
status.
Update status (procedure)
You can update the status in various ways:
•Open the program editor window and enable the program status (menu "Test" > "Program status") in order
to view the continuous status update in the RUN operating status of the target system.
Bear in mind that "continuous" does not mean in real time; instead, it means that the programming device
quickly polls the PLC for status information and displays it on your screen, updating the display as quickly as
your communications permit. Some rapidly fluctuating values may not be identified and displayed on your
screen. It is also possible that the values change too quickly for you to read them. You can update the status
once if you switch the target system to the STOP operating state. Even if the target system is in the STOP
operating state, you can use the "Multiple cycles" command to view one or more cycles. Using the "First
cycle" function, you can view a single cycle - whereby the bit memory of the first cycle is activated.
•Open the status chart window and enable the chart status to view continuous updates when the target
system is in the RUN operating status.
•Disable the chart status and use the "Single read" function if you wish to update the status and you do not
want to switch the target system into the STOP mode.
If you switch the target system into the STOP operating state and enable chart status, then this also enables
you to update the status. Furthermore, you can use the "Multiple cycles" and "First cycle" functions while you
are viewing a status chart.
14.4.1.6

Simulating process conditions

You can simulate process conditions by writing new values to addresses. To do so, use the status chart.
14.4.1.7

Checking cross references and the elements used

If you test your program, it is possible that you wish to supplement, delete or change the parameters.
In the window "Cross-references", you can determine how the parameters are presently assigned in your
program. This helps you to avoid assigning values twice.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
P4: PLC for SINUMERIK 828D
14.4 Test and diagnostic functions
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