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What do the Memory Protect slide switch settings signify in the 140CPU31110?

Mem Prt Off - allows run/stop CPU and application changes.
Not Used - should not be used as it can lead to undefined operation. Produces "Error while trying to run the project;
mode cannot be changed (ex: an I/O forces the PLC to STOP)" when the user tries to run/stop CPU or
modifiy application.
Mem Prt On - prohibits run/stop CPU or modification of applications.

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