Logic Blocks In Use - Siemens SIMOCODE pro V Manual

2 Operating principle
The function plan in
shows the supplementary logic for blockage prevention (hereafter referred to
shorthand as "logic"). The standard interconnections for the underlying reversing
starter are not part of
2.1

Logic blocks in use

Truth table
A logical linkage of digital signals can be implemented with a truth table. For ease
of understanding,
gates. Truth tables with the following input/output quantity structures are available:
•
"3I/1O"
•
"2I/1O"
•
"5I/2O"
Detailed information is available in manual \3\.
Figure 2-2
1
2
3
Counters
For every positive edge at one of the counter inputs (+/-), the counter value is
incremented or decremented. The application example only uses the "+" counter
inputs. If the defined limit value is reached, e.g. 4 for Counter 1, the output (Q)
switches to "true". The counter can be reset to 0 with the reset input (R). The
counter value is available as an output.
Detailed information is available in manual \3\.
Figure 2-3
Counter 1
+
R
Blocking Protection for Pumps with SIMOCODE pro V
Article ID: 109478058, V2.0,
Figure 2-1, which is referenced by the following models, only
Figure 2-1.
Figure 2-1 shows the truth tables as gates or a combination of
TT4
&
≥1
&
Value
4
Q
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