Mitsubishi 800 Series User Manual page 123

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
e m ~ t v
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
i s
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
i s
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
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