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Monitor  （33:276）  Block  not  found !

Help on Message 33:276

Description:
The block could not be cut or deleted in the PLC because it is a system block or a system function.
ONLINE: Message from the module:
  D204 = No linked block in given storage medium.
  D209 = At least one listed block not available on the module.
  D20E = No block available reading directory of PLC.
  EPROM = The block does not exist on the Memory Card/MMC.
Remedy:
OFFLINE:  Save block in database.
ONLINE:  Download block to the module.
EPROM:  Save block on the Memory Card/MMC.


求助，為什么會出現這個情況呢？

我應該怎么解決��？？

謝謝！