5 Operation
5-24
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
4
The downloading process is handled by the CJ1W-PRM21 Master DTM. The CJ1W-PRM21
Master DTM will switch the Master Unit to OFFLINE, commence the download, and after suc-
cessful download, issue a command to the Master Unit to store the parameter sets in the Unit. A
window is displayed to show the progress of the download.
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After storage has been completed, the CJ1W-PRM21 Master DTM will issue a command to
restart the CJ1W-PRM21 PROFIBUS Master Unit. The new parameter sets will then become
effective.
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After restarting the Unit, a warning window will be displayed, allowing the user to switch the
CPU back to its original mode.
Note 1 When switching the CPU back to its original mode, after download, the PROFIBUS Master
Unit will behave according to the setting made in the Master Setup Tab (see section 5-4-1
Setting the Master Parameters) If the Action to CPU mode change has been set to go to
OPERATE mode when the CPU switches to RUN mode, the last action of the download
process may start up the network. Therefore, if this is not desired, care must be taken to
select the right setting.
2 In case of a failure in the download process, refer to 7-4-1 Troubleshooting Parameter
Download to establish the cause and the remedy.
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