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Siemens LOGO Soft Comfort Online Help Manual

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LOGO!Soft Comfort Online Help
42 Operating Instructions, 11/2017
The following rules apply to the conversion from LAD to FBD:
● A series circuit of contacts is converted into an AND block.
● A parallel circuit of contacts is converted into an OR block.
● User-defined comments are not included, as their position in the circuit program cannot
be defined based on blocks.
● Crosslinks (connections where a block output is connected to multiple block inputs and at
least one of the inputs is connected to multiple block outputs) are converted into an OR
block.
Inputs for the OR block are all block outputs of the crosslink.
The output of the OR block is connected to all block inputs of the crosslink.
● Internal flags are resolved, and the current paths are linked.
This function is inactive in the UDF Editor.
Use this function to convert your circuit program between FBD and LAD.
● An AND block is converted into a series contact circuit
● An OR block is converted into a parallel contact circuit
● Comments for basic functions are not applied in LAD, as a basic function is converted
into multiple contacts. Thus, the comment cannot be assigned definitely.
● In LAD, input comments are assigned to all contacts of this input.
● User-defined comments are not included, as their position in the circuit program cannot
be defined based on blocks.
● XOR blocks must be converted into corresponding LAD logic consisting of positive and
negative contacts.
Note
When conver
ting between LAD and FBD, the total number of blocks in your circuit program
can sometimes increase. This could cause the permitted number of blocks for your LOGO! to
be exceeded.
You cannot, therefore, always convert FBD programs to LAD.
Remedy:
Under Tools -> Select Hardware (Page 97
), select the hardware series that you are
using. Start converting to LAD. Then under
Tools -> Determine LOGO! (Page 97
), see which
hardware series is compatible with the circuit program.
If your circuit diagram contains a UDF block, you cannot use this function
to convert it from
FBD to LAD.
See also
Tools -> Select Hardware (Page 97)
… 42 …


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