Blocks And Block Numbers - Siemens LOGO! Series Manual

Programming LOGO!

3.3 Blocks and block numbers

3.3 Blocks and block numbers
This chapter shows you how to use LOGO! elements to create complex circuits and how
blocks and I/O are interconnected.
In the topic "From circuit diagram to LOGO! Program (Page 76)" you will learn how to
transform a conventional circuit into a LOGO! circuit program.
Blocks
A block in LOGO! represents a function that is used to convert input information into output
information. Previously you had to wire the individual elements in a control cabinet or
terminal box.
When you create the circuit program, you interconnect the blocks. To do so, simply select
the connection you require from the Co menu. The menu name Co is an abbreviation of the
term "Connector".
Logic operations
The most elementary blocks are the logic operations:
● AND
● OR
● ...
These special functions offer you significantly greater performance:
● Pulse relay
● Up/down counter
● On-delay
● Softkey
● ....
The chapter entitled "LOGO! functions (Page 137)" gives a full list of the LOGO! functions.
74
Manual, 04/2011, A5E03556174-01
LOGO!