Backing Up The Scan List - Omron CJ1W-DRM21 Operation Manual

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.
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Backing Up the Scan List

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:
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.
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.
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
4 Remote I/O Master Communications
4
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