Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 228)

L-force | PLC Designer
The Individual Components
226 DMS 3.2 EN 02/2011 TD29

For boolean variables, the value is toggled (switched between TRUE and FALSE, with
no other value allowed) by double-clicking on the line in which the variable is
declared; no dialog appears.
The value set for Writing is displayed in brackets and in turquoise colour behind the
former value of the variable. e.g. a=0 <:=34>.
Note!
Exception: In the FBD and LD Editor the value is shown turquoise without brackets
next to the variable name.
Set the values for as many variables as you like.
The values entered to be written to variables can also be corrected or deleted in the
same manner. This is likewise possible in the 'Online' 'Write/Force dialog' (see below).
The values to be written that were previously noticed are saved in a writelist
(Watchlist), where they remain until they are actually written, deleted or transferred
to a forcelist by the command 'Force values'.
The command to Write Values can be found at two places:
• Command 'Write Values' in the menu 'Online'.
• Button 'Write Values' in the dialog 'Editing the writelist and the forcelist'.
When the command 'Write values' is executed, all the values contained in the writelist
are written, once only , to the appropriate variables in the controller at the beginning
of the cycle, then deleted from the writelist. (If the command 'Force values' is
executed, the variables in question are also deleted from the writelist, and transferred
to the forcelist!)
Note!
In the sequential function chart language (SFC), the individual values from which a
transition expression is assembled cannot be changed with 'Write values'. This is
due to the fact that in monitoring the 'Total value' of the expression, not the values
of the individual variables are displayed (e.g. "a AND b" is only displayed as TRUE if
both variables actually have the value TRUE).
In FBD, on the other hand, only the first variable in an expression, used for example as
input to a function block, is monitored. Thus a 'Write values' command is only possible
for this variable.