Status variables
Using the "status variables" function, you can display the current
signal states of certain operands (process variables).
When a checkpoint is reached, the PG displays the present signal
status of the desired process variable. You can display the following
process variables: inputs, outputs, flags, timers, counters and data
words. No addressing error (ADF) is triggered in the process image
area.
Sequence in RUN
If the function is active in the RUN mode, the signal states of the
operands are scanned and displayed when the checkpoint is reached.
The system program reads inputs from the process image. As long as
the function is not aborted, signal states are updated cyclically.
Note
If the program does not reach the system checkpoint, the system
program does not output the signal states (e.g., in a continuous
loop in the user program).
Sequence in
SOFT STOP
When the function is active in the STOP mode, the signal states of the
operands are displayed when they exist at the system checkpoint. It is
important to note that the inputs are scanned and output directly on the
I/O module.
Force
You can call the "force" PG function to manually set the output bytes
of the programmable controller to the signal states you want.
Note
The "force" function is only permitted in the stop mode (SOFT
STOP mode or within the "program test" function).
Sequence of the function
When you call the "force" function in the STOP mode, the disable
output command signal is suppressed (i.e., the BASP LED is off). All
digital peripherals are cleared (i.e., the value 0 is written to each
address). While the peripherals are being cleared, this function cannot
be interrupted. If any timeout signals (QVZs) occur while the outputs
are being cleared, they are ignored.
PG Functions
CPU 948 Programming Guide
11 - 14 C79000-G8576-C848-04
To Next Page
Loading...
Need help?
General
