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Scan List Section 4-2
nect/Connect Switch for that slave (words n+6 to n+9). This can be done
when a slave is replaced or to register a slave in the scan list in prepara-
tions to connect it to the network at a later time. The Disconnect/Connect
Switches, however, are cleared when the power supply is turned OFF, so
the bit must be turned back ON from the ladder program after the power
turns ON in order for it to remain effective.
2. Use Configurator Ver. 2.10 or later for the CJ1W-DRM21.
4-2 Scan List
A scan list is used to register the slaves with which the Master Unit communi-
cates in DeviceNet remote I/O communications. It is the basis on which the
Master Unit communicates with slaves.
The Master Unit does not contain a scan list by default. The CS/CJ-series
DeviceNet Unit, however, has a default setting that allows it to communicate
with all slaves even with the scan list disabled, but this operating mode should
not be used for normal operation. Always create a scan list prior to operating
the Unit.
Scan List Contents The contents of the scan list is listed in the following table. When a Master
Unit goes online, it compares each of these items with the slaves that are
actually connected to the network. The items that are compared, however, will
depend on the allocation method that is used.
Item Description Fixed allocations User-set allocations
using allocated DM
Area words
User-set allocations
from the
Configurator
Node address Node address for
every Slave
Compared Compared
Allocated IN/OUT
sizes and allocation
Settings of the num-
ber of bytes allocated
to every slave in a data
area of the Master Unit
Compared Compared
Vendor Unique manufacturer
ID
Not compared Set from Configurator
Device type Unique product type
value
Not compared Set from Configurator
Product code Unique product model
value
Not compared Set from Configurator
Connection type Applicable DeviceNet
protocol
(See Appendix B
DeviceNet Connec-
tions for details.)
Automatically set Automatically set or
set from Configurator
Connection path Type of slave I/O data
(See Appendix B
DeviceNet Connec-
tions for details.)
Cannot be set Set from Configurator