Blocks And Block Numbers - Siemens LOGO! 24RC Manual

Programming LOGO!

3.2 Blocks and Block Numbers

In this chapter, we will describe how you can create exten-
sive circuits with the aid of LOGO!'s elements and how the
blocks are linked to each other and to the inputs and out-
puts.
For this purpose, please turn to Section 3.3. There we de-
scribe how to turn a conventional circuit into a LOGO! pro-
gram.
Blocks
A block in LOGO! is a function which converts input infor-
mation into output information. With earlier variants of
LOGO! you had to wire up the individual elements in the
control cabinet or terminal box.
When you program LOGO! you connect connectors with
blocks. To do this, simply select the connection you require
from the Co menu (Co stands for connector).
Logic operations
The simplest blocks are logic operations:
AND
OR
...
1
2
x
We have made the special functions far more powerful
than before:
Current impulse relay
Counter
On delay
....
Chapter 4 provides a complete list of LOGO!'s functions.
30
Inputs I1 and I2 are connected to the
1
OR block. The last input of the block
is not used and is therefore marked
Q
with an x.
LOGO! Manual
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