Lenze PLC Designer PLC Designer (R2-x) Manual de usuario descargar pdf (Pagina 73)

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L-force | PLC Designer

What is What in PLC Designer

 DMS 3.2 EN 02/2011 TD29 71

Each network consists on the left side of a series of contacts which pass on from left to

right the condition "ON" or "OFF" which correspond to the Boolean values TRUE and

FALSE. To each contact belongs a Boolean variable. If this variable is TRUE, then the

condition is passed from left to right along the connecting line. Otherwise the right

connection receives the value OFF.

Example of a network in a Ladder Diagram made up of contacts and coils

Contact

Each network in LD consists on the left side of a network of contacts (contacts are

represented by two parallel lines: | |) which from left to right show the condition "On"

or "Off".

These conditions correspond to the Boolean values TRUE and FALSE. A Boolean

variable belongs to each contact. If this variable is TRUE, then the condition is passed

on by the connecting line from left to right, otherwise the right connection receives

the value "Out".

Contacts can be connected in parallel, then one of the parallel branches must transmit

the value "On" so that the parallel branch transmits the value "On"; or the contacts are

connected in series, then contacts must transmit the condition "On" so that the last

contact transmits the "On" condition. This therefore corresponds to an electric parallel

or series circuit.

A contact can also be negated, recognizable by the slash in the contact symbol: |/|.

Then the value of the line is transmitted if the variable is FALSE.

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