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The M91  and JAZZ Series PLC's have 2 Passwords that can be set.

      1 Password   BLOCKS   ALL   Communications to the PLC ( No download, no upload, no devices that need communications to operate)

               When  this is set, then you have to know the password  to unlock  it.

      1  Password  allows communication, BUT does not allow UPLOAD  of the program unless you have the password.

      There is NO Backdoor to getting to the  program if these passwords are set

Refer to Help  -- Project properties for the explanations.

If the PLC was programmed by the machine manufacturer, then contact them. They had reasons to protect the PLC from being tampered with.



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