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Omron SYSMAC C Series User Manual

Omron SYSMAC C Series
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Scan
time
Total
execution
time
=
512
addresses
X
14.75us
=
7.55ms
Adding
the
four
parameters
provides
the
total
scan
time:
1.07ms
+
1.04ms
+
7.55ms
+
1.1ms
=
10.76ms
Notice
that
if
no
peripheral
device
is
connected
to
the
PC,
the
fourth
parameter
in
this
equation
is
Oms.
Next,
let's
consider
the
scan
time
for
a
system
that
has
a
56-point
expansion
I/O
unit
connected
and
the
user
program
consists
of
1194
addresses.
Again,
it
is
assumed
that
only
the
LD
and
OUT
instructions
are
used
in
the
program.
As
before,
there
are
two
known
factors:
common
process
time
and
peripheral
device
command
servicing
time,
which
are
1.07ms
and
1.1ms,
respectively.
The
variable
N
of
the
equation
for
calculating
the
data
input/output
time
is
2
because
a
56-point
expansion
I/O
unit
is
used.
Therefore,
the
data
input/output
time
is:
1.04ms
+
(0.33ms
x
2)
=
1.7ms
Because
the
program
has
1194
addresses
and
uses
only
the
LD
and
OUT
instructions,
the
total
instruction
execution
time
is:
1194
addresses
x
14.75us
=
17.61ms
Therefore,
the
scan
time
is:
1.07ms
+
1.7ms
+
17.61ms
+
1.1ms
=
21.48ms
Input/output
response
time
of
PC
Response
time
means
the
time
from
when
the
PC
receives
an
input
signal
until
it
outputs
a
control
signal.
This
response
time
varies.
If
the
PC
receives
an
input
signal
immediately
after
one
scan
time
has
finished
and
if
the
input
ON-delay
time
of
the
PC
is
minimum,
the
response
time
is
minimized.
If
those
two
factors
exist,
the
response
time
can
be
obtained
by
simply
adding
together
the
minimum
input
ON-delay,
output
ON-
delay,
and
scan
times
of
the
PC.
However,
if
the
PC
receives
the
input
signal
when
one
scan
time
has
just
started
and
the
input
ON-delay
time
is
the
maximum
value,
the
response
time
is
longer.
This
is
because
the
CPU
must
wait
until
the
end
of
the.
`
preceding
scan
time
before
the
input
signal
can
be
accepted.
Therefore,
the
maximum
response
time
is
the
sum
of
the
maximum
input
ON-delay,
output
ON-delay,
and
two
scan
times.
The
timing
charts
of
the
minimum
and
maximum
response
times
required
for
the
PC
to
execute
the
following
program
are
shown
next.
C-5

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Omron SYSMAC C Series Specifications

General IconGeneral
BrandOmron
ModelSYSMAC C Series
CategoryController
LanguageEnglish

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