12.
System
Configurations When Making
Bus
Connections
MELSEC
GOT
12.1
Useful
Infomation
When
Making
Bus
Connections
12.1.1 PC CPU handling
of
the
GOT
with
bus
connections
When using a bus connection, the PC CPU recognizes the GOT as
a
special function
module with 32
I/O
points. For this reason, when one GOT is connected, there must
always be one empty
I/O
slot (32 empty points) on the expansion base module.
When connecting two
GOT
modules, there must be two empty slots (64 empty points),
and when connecting three GOT modules,
3
slots are required (96 empty points).
Even
if
there are no emDtv
I/O
slots. however. the GOT can be connected and used
throuah a bus connection if the number of
em~tv
Doints listed below are available.
Connecting 1 GOT
...........
32 points
Connecting
2
GOTs
.-.--.I..
64
points
Connecting 3 GOTs
.-....-..
96 points
12.1.2 Restrictions when using
a
direct PC CPU connection
If
a direct
I/O
control is being used with the CPU connected to the GOT, the empty slot
input
X
cannot be used when the GOT is connected as described below.
When
a
5
m
(1
6
feet) expansion cable
(AC5OB
(-R),
A1
SC50NB) is
used
to connect one
GOT to the main/expansion base unit.
The above restrictions do not apply
if
the refresh method
is
being used for
I/O
control.
With a PC CPU in which the
I/O
control method can be changed using a switch, the
method should be set to the refresh method.
When input
X
of
the empty slot is being
used
1)
When input
X
has been assigned with the MELSECNET
(11,
/B)
data link or
MELSECNET/lO network
2)
When the data received from the MELSECNET/MINI-S3 data link is read to the
FROM
command input
X
3)
When input
X
of the empty slot
is
turned on and
off
from the calculator link unit
4) When input
X
of the empty slot is turned on and
off
using a touch switch func-
tion (bit SET/RST, alternate, momentary) of the GOT
12-3
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