Lenze PLC Designer PLC Designer (R3-1) - Manual (Page 306)

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304 DMS 4.1 EN 03/2011 TD29
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To negate a contact or coil select the element (cursor positions 8 resp.9) and use the
command. Notice that the ToolBox in category 'Ladder elements' provides negated
contact elements for inserting by drag&drop.
To negate the an input or output put the cursor according to cursor positions 2 or 4.
To negate a jump or RETURN instruction select the last preceding output (cursor
position 4).
To cancel the negation of an element use the same cursor positions and also perform
the Negate command.
Note: Concerning the view options for the components of a LD / FBD network notice
the settings in the 'FBD/LD and IL editor Options'.
12.13.27 Edge Detection
Symbol: (FBD), (LD)
Shortcut: <Ctrl> + <E>
This command (category 'FBD / LD / IL') is used in FBD or LD to insert an edge detection
element at a boolean input. This corresponds to inserting a R_TRIG function block for
detecting a rising edge (FALSE -> TRUE) respectively a F_TRIG function block for
detecting a falling edge (TRUE -> FALSE).
When the command is performed repeatedly at the same insert position, the inserted
element will toggle between rising edge detection (
), falling edge detection ( )
and none.
Abb. 116 Example, Edge Detection at SEL operator
In this example a Edge Detection element has been inserted when the first input (b1)
of the SEL box was selected. The SEL operator will have output "1" each time a rising
edge is detected at its input.
The command is not available in IL editor. A network containing an edge detection will
be kept unmodified after conversion from FBD/LD to IL.
Note: Concerning the display options for the components of a LD / FBD network
notice the settings in the 'FBD/LD and IL editor Options'.