Displaying And Editing Plc And Nc Variables - Siemens SINUMERIK 840D sl Operating Manual

Procedure
24.3

Displaying and editing PLC and NC variables

Changes can only be made to the NC/PLC variables with the appropriate password.
Incorrect parameterization
Changes in the states of NC/PLC variables have a considerable influence on the machine.
Incorrect configuration of the parameters can endanger life and cause damage to the machine.
In the "NC/PLC Variables" window, enter the NC system variables and PLC variables that you
want to monitor or change in the list:
● Variable
Address for NC/PLC variable.
Incorrect variables have a red background and are displayed with a # character in the value
column.
● Comment
Any comment on the variable.
The columns can be displayed and hidden.
● Format
Specify the format in which the variable is to be displayed.
The format can be specified (e.g. floating point).
● Value
Displays the actual value of the NC/PLC variables.
PLC variables
Inputs
Outputs
Milling
Operating Manual, 05/2017, A5E40868956
1. Ladder add-on tool is open.
You have changed project data.
2. Press the "PLC Stop" softkey if the PLC is in the Run state.
3. Press the "Load to CPU" softkey to start the loading operation.
All data classes are loaded.
4. When the PLC project has been loaded, press the "PLC Start" softkey to
switch the PLC to the Run state.
WARNING
● Input bit (Ex), input byte (EBx), input word (EWx), input double word (EDx)
● Input bit (Ix), input byte (IBx), input word (IWx), input double word (IDx)
● Output bit (Ax), output byte (ABx), output word (AWx), output double word
(ADx)
● Output bit (Qx), output byte (QBx), output word (QWx), output double
word (QDx)
Edit PLC user program (828D only)
24.3 Displaying and editing PLC and NC variables
819