Siemens SINUMERIK 840D sl Function Manual page 910

P3: Basic PLC program for SINUMERIK 840D sl
13.16 Basic conditions and NC VAR selector
There are three options:
● Display all data
● Input area, block and name (incl. combinations)
● Display MD/SE data number
The following wildcards can also be used:
*
Example search criteria
Name search criterion: CHAN* Found:
● Select variable
A variable is selected by means of a simple mouse click and transferred to the window of
selected variables by double-clicking. This action can also be undone under the "Edit" menu
item.
Alias name
The variable names provided can be up to 32 characters in length. To make variables clearly
identifiable in the data block to be generated, several ASCII characters are added to the
selected name. However, the STEP 7 compiler recognizes only 24 ASCII characters as an
unambiguous STEP 7 variable. Since it cannot be precluded that variable names can only be
differentiated by the last 8 character positions, ALIAS names are used for names, which are
too long. When a variable is selected, the length of the STEP 7 name to be used is, therefore,
checked. If the name is longer than 24 characters, the user must enter an additional name,
which is then used as the alias.
In this case, the user must ensure that the alias name is unambiguous.
Alias input can always be activated by the user in the "Options" menu.
An alias name can then be entered every time a variable is transferred.
It is also possible to edit alias names at a later point in time by double-clicking on the S7 variable
name field. This action can also be undone under the "Edit" menu item.
910
To extend the search criterion as required
CHAN_NAME
chanAlarm
chanStatus
channelName
chanAssignment
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions