365
Data Exchange with CPU Bus Units Section 8-6
Some models transfer data in both directions, from the DM Area to the Unit
and from the Unit to the DM Area. See the Unit’s Operation Manual for details
on data transfers.
These 100 words are generally used to hold initial settings for the CPU Bus
Unit. When the contents of this area are changed from the program to reflect a
change in the system, the Restart Bits (A50100 to A50115) for affected Units
must be turned ON to restart the Units.
FINS Commands
The CMND(490) instruction can be added to the ladder program to issue a
FINS command to the CPU Bus Unit.
FINS commands can be transmitted to CPU Bus Units in other PLCs in the
network, not just the local PLC.
CPU Bus Unit Initialization
CPU Bus Units are initialized when the PLC’s power is turned on or the Unit’s
Restart Bit is turned ON. The Unit’s CPU Bus Unit Initialization Flag (A30200
to A30215) will be ON while the Unit is initializing.
CPU Unit
CPU Bus Unit
DM Area for CPU Bus Units
100 words/Unit
Transferred
when power
is turned ON
or the Unit is
restarted.
Transferred
each cycle
and when
necessary.
CPU Unit
CPU Bus Unit
FINS
com-
mand
trans-
mission
The FINS command is trans-
mitted when CMND(490) has
been executed in the program.
CPU Unit
CPU Bus Unit
CPU Unit
Serial Communications
Unit
Serial Communications
Unit
Command transmission
The FINS command is
transmitted when
CMND(490) has been
executed in the program.
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