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C
1.9.3)
Logic sequences
with
O-commands
A logic sequence
with
O-commands
effects
a parallel switching
of contacts.
The contacts
are normally
open.
This corresponds
to an OR-gate.
PLC-Programme
Gating llogic
Abbreviated
Examples:
a)
b)
t
+24V
t
+24V
L
Lamp Ll is connected
to output
43.
The relay K8 should
energise when the contacts
S9
The closing of contact
S'l illuminats
the lamp.
or Sl!j or S21 of any combination
therefore
are
The contact
is connectecl
to input E27 of the PLC
simuhaneously
closed.
PLC-Programme:
0 E2;7
= A43
PLC-Programme:
0 El1
0 El8
0 E 29
= A32
This PLC-programme
effects
the following
switching:
This F'LC-programme
effects
a parallel switching
of
contacts
S9, S15 and S21:
r
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