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4-13
4 Remote I/O Master Communications
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
4-2 Scan
List
4
4-2-3 Bac
k
ing Up the Scan List
Precautions for Correct Use
Precautions for Correct Use
The scan list is automatically enabled when user-set allocations are set using the device vari-
ables for CJ-series Unit or the CX-Integrator. If the list is subsequently cleared using
*_Sw1SListClrCmd
(Scan List Clear Switch), fixed allocations (1 to 3) will be used for remote I/O
communications when the scan list is disabled. Make sure the system has stopped before you
disable the scan list with a Master Unit that is set for user-set allocations. Particularly when mul-
tiple Master Units are connected to a single network, communications will not be performed suc-
cessfully if even one Master Unit on the network is operating with the scan list disabled. Once the
list is disabled, the user-set allocations data registered in the Master Unit is lost.
A scan list must be created to switch the DeviceNet Unit to operation with the scan list disabled or to
replace a DeviceNet Unit. It is important to back up the list with the use of one of the following methods:
z
Fixed Allocations or User-set Allocations in Device Variable for CJ-series Unit
Save the scan list as a backup file on SD Memory Card in the CPU Unit by changing
*_Sw2FileBkupCmd
(Unit Setup File Backup Switch) to TRUE.
z
User-set Allocations from the CX-Integrator
Save the scan list as a backup file on SD Memory Card or save it either as a device parameter file or
project file by using the CX-Integrator.
In the preceding cases, change
*_Sw2FileRestoreCmd
(Unit Setup File Restore Switch) to TRUE to
input setup data including the scan list backed up on the SD Memory Card into a DeviceNet Unit.
4-2-3
Backing Up the Scan List
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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