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Omron SYSMAC C Series User Manual

Omron SYSMAC C Series
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Chapter
3
Introduction
to
programming
y
Overview
This
chapter
introduces
the
eight
steps
you'll
take
in
creating
the
program
the
PC
uses
to
carry
out
its
control
operations.
You
can
skip
this
chapter
if
you're
already
familiar
with
PC
programming
using
relay
ladder
dia-
grams.
Instead,
you
may
wish
to
go
directly
to
Chapters
4
and
5
which
focus
on
how
the
C20
programming
console
is
used
to
install
the
program
in
the
memory
of
the
CPU.
Relay
ladder
diagram
method
If
you're
an
old
hand
at
relay-based
control
systems,
you'll
find
a
lot
that's
familiar
in
the
way
a
PC
works.
This
is
because
the
circuits
and
internal
logic
of
the
PC
take
the
place
of
the
relays,
timers,
counters,
and
other
formerly
discrete
devices.
The
actual
operation
of
the
machinery
takes
place
as
if
those
discrete
devices
were
still
in
place,
but
with
a
great
deal
more
flexibility
and
reliability.
But
even
if
the
actual
devices
are
gone,
the
symbols
and
other
control
concepts
used
to
describe
their
operation
still
are
used.
These
are
the
basis
of
the
relay
ladder
diagram
programming
method.
This
chapter
has
been
written
on
the
assumption
that
you
are
already
experienced
with
this
relay
symbology,
or
have
access
to
information
that
can
teach
you
about
it.
Eight
basic
programming
steps
In
creating
the
control
program
for
the
PC,
you'll
foliow
these
eight
basic
steps:
1.
Determine
what
the
controlled
system
must
do
and
in
what
order.
2.
Assign
input
and
output
devices,
that
is,
designate
the
external
devices
that
will
send
signals
to
and
receive
signals
from
the
PC.
3.
Draw
a
diagram,
using
relay
ladder
symbols.
This
represents,
in
the
correct
sequence,
all
of
the
required
functions
and
their
relationship.
4.
Code
the
ladder
symbols
into
a
form
that
can
be
input
to
the
CPU
by
the
programming
console.
5.
Transfer
these
written
instructions
to
the
CPU
via
the
programming
console.
6.
Edit
the
program.
7.
Test
the
program
for
errors.
8.
Save
the
completed
program.
Steps
1
through
4
are
the
focus
of
this
chapter.

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Omron SYSMAC C Series Specifications

General IconGeneral
BrandOmron
ModelSYSMAC C Series
CategoryController
LanguageEnglish

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