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4-11
4 Remote I/O Master Communications
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
4-2 Scan
List
4
4-2-1 Scan List
4-2
Scan List
A scan list is used to register the slaves with which the Master Unit communicates 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. 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.
z
Scan List Contents
The contents of the scan list is listed in the following table. When a Master Unit goes online, it com-
pares 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.
4-2-1
Scan List
Item
Description
Fixed allocations
User-set allocations
using device vari-
ables for CJ-series
Unit
User-set allocations
from the CX-Integra-
tor
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 Mas-
ter Unit
Compared
Compared
Vendor
Unique manufacturer
ID
Not compared
Set from CX-Integra-
tor
Device type
Unique product type
value
Not compared
Set from CX-Integra-
tor
Product code
Unique product model
value
Not compared
Set from CX-Integra-
tor
Connection type
Applicable DeviceNet
protocol
(See
A-2 DeviceNet
Connections
for
details.)
Automatically set
Automatically set or
set from CX-Integrator
Connection path
Type of slave I/O data
(See
A-2 DeviceNet
Connections
for
details.)
Cannot be set
Set from CX-Integra-
tor
Содержание CJ1W-DRM21
Страница 12: ...Manual Structure 10 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 ...
Страница 42: ...Revision History 40 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 ...
Страница 214: ...6 Message Communications 6 26 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 ...
Страница 345: ...Index 1 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 I Index ...
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