!PROGRAMMING
-1
OR is a normally open contact parallel connection instruction and
OR1
is
the normally
closed contact parallel connection instruction. They use the
ON/OFF
data
of
the
specified device, perform the OR/ORI operation using this data and the previous
operation result.
A
new operation result is then produced.
Below
is
an example ladder logic program and
its
equivalent sequence instruction list
using the instructions described in this section.
98
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