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Omron SYSDRIVE 3G3RV Series User Manual

Omron SYSDRIVE 3G3RV Series
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6
-
114
nCommunications
Response
Time
The
communications
response
times
for
communications
with
an
Inverter
via
the
RS-422/485
port
of
an
Omron-made
Communications
Board
are
detailed
below.
Use
this
information
as
a
reference
when
deciding
the
number
of
Slaves
to
be
connected
to
one
network,
and
when
considering
the
timing
of
input
and
output
signals.
Communications
Time
for
One
Message
A
wide
variety
of
programs
for
RS-422/485
communications
can
be
created
using
the
protocol
macro
func-
tion.
The
communications
times
will
vary
according
to
the
contents
of
the
program.
In
general,
the
communications
time
for
one
message
can
be
calculated
using
the
following
formula.
Calculation
Example
The
communications
time
required
for
one
Slave
in
the
protocol
macro
created
under
Creating
a
Project
File,
can
be
calculated
according
to
the
following
formula.
(Baud
rate
=
19,200
bps.)
If
there
are
N
Slaves,
the
total
communications
time
will
be
N
x
81.2
ms.
Consequently,
the
more
Slaves
that
are
used,
the
longer
the
communications
time
will
be.
If
the
number
of
Slaves
is
too
high,
it
is
possible
that
the
detection
time
of
2
s
for
communications
time-over
will
be
exceeded.
In
this
case,
either
disable
the
time-over
detection
function
and
use
a
different
sequence
to
detect
communications
errors,
or
increase
the
number
of
Masters
thereby
decreasing
the
number
of
Slaves
per
Master.
Communications
time
=
[Number
of
bytes
in
DSR
message
x
10
(See
note
1.)
x
(1/baud
rate)
x
1,000
(ms)]
+
[Number
of
bytes
in
response
x
10
x
(1/baud
rate)
x
1,000
(ms)]
+
[24
x
(1/baud
rate)
x
1,000
(ms)]
+
send
wait
time
setting
(ms)
+
protocol
macro
waiting
time
(See
note
2.)
(ms)
The
reason
that
the
number
of
bytes
in
the
DSR
message
and
response
is
multiplied
by
10
is
because
both
the
start
bit
and
the
stop
bit
require
one
bit
each.
(1
byte
=
8
bits)
+
(start
bit:
1
bit)
+
(stop
bit:
1
bit)
=
10
bits
With
RS-422A/485
communications,
set
at
least
20
ms
as
the
protocol
macro
waiting
time.
Communications
time
=
[DSR
message
to
write
data
(13
bytes)
+
DSR
message
to
read
(8
bytes))
x
10
x
(1/
19,200)
x
1,000
(ms)]
+
[write
response
(8
bytes)
+
read
response
(7
bytes))
x
10
x
(1/19,200)
x
1,000
(ms)]
+
[24
x
(1/19,200)
x
1,000
(ms)
x
2]
+
[10
(ms)
x
2]
+
[20
(ms)
x
2]
=
81.2
(ms)

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Omron SYSDRIVE 3G3RV Series Specifications

General IconGeneral
BrandOmron
ModelSYSDRIVE 3G3RV Series
CategoryInverter
LanguageEnglish

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