1.
INTRODUCTION
/MELSEC-A
1.1
General Description
of
Operation
This section describes the data communication between the
A2C,
the remote
I/O
module and the remote terminal module.
See
Section
4.2
for the
A2C
functions.
1.1.1
ON/OFF
data
communication between
the
A2C
and
the
remote
I/O
module
ON/OFF data communication
is
performed using inputs
(X)
and
outputs
(Y).
(1)
Inputloutput number assignment
of
the remote
I/O
module
The inputloutput numbers
of
the
AX
system are assigned
from
X/YOOO
to
W1
FF
in the order of the station number
(1
to
64)
set
for each remote
110
module.
Data communication with
a
remote
I/O
module
is
performed
using inputs
(X)
and outputs
(Y)
assigned for each module.
See Section
4.7
for the relationship between station numbers
and
I/O
numbers.
(2)
ON/OFF data communication with the remote
VO
module
The ON/OFF data communication with the remote
I/O
module
is
performed in the refresh mode.
Fig.
1.1
shows the data communication between the
AX
and
the remote
I/O
modules.
t
I
The
sequence
program
UWE
input
(X)
and
output
(Y)
numbers to control remote
UO
mod-
I
(b)
ONIOFF
data
of
output
(Y)
is
output.
/
(c)
ONlOFF
data
from
the input module
is taken in.
MINI-S3
link
Station: n Station:
5
When the
A2C
is
running, operations
(a),
(b)
and
(c)
mentioned below are executed
repeatedly.
(a)
The sequence program is executed from step
0
to END (FEND).
(b)
ON/OFF data of an output
(Y)
in
the sequence program
is
output by the MINI43 link.
(c)
ON/OFF data from an input module
is
taken in by the MINIS3 link.
Fig.
1.1
OWOFF
Data
Communication
between
th.
AZC
and
the
R.mote
I/O
Modukr
1
I
1
3
??
‘I’
1
1
1
1
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