GE 90-30/20/Micro manual Privilege Level Change Requests, Locking/Unlocking Subroutines

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Privilege Level Change Requests

A programmer requests a privilege level change by supplying the new privilege level and the password for that level. A privilege level change is denied if the password sent by the programmer does not agree with the password stored in the PLC’s password access table for the requested level. The current privilege level is maintained and no change will occur. If you attempt to access or modify information in the PLC using the Hand-Held Programmer without the proper privilege level, the Hand-Held Programmer will respond with an error message that the access is denied.

Locking/Unlocking Subroutines

Subroutine blocks can be locked and unlocked using the block locking feature of programming software. Two types of locks are available:

Type of Lock

Description

View	Once locked, you cannot zoom into that subroutine.
Edit	Once locked, the information in the subroutine cannot be edited.

A previously view locked or edit locked subroutine may be unlocked in the block declaration editor unless it is permanently view locked or permanently edit locked.

A search or search and replace function may be performed on a view locked subroutine. If the target of the search is found in a view locked subroutine, one of the following messages is displayed, instead of logic:

Found in locked block <block_name> (Continue/Quit)

or

Cannot write to locked block <block_name> (Continue/Quit)

You may continue or abort the search.

Folders that contain locked subroutines may be cleared or deleted. If a folder contains locked subroutines, these blocks remain locked when the programming software Copy, Backup, and Restore folder functions are used.

Permanently Locking a Subroutine

In addition to VIEW LOCK and EDIT LOCK, there are two types of permanent locks. If a PERMANENT VIEW LOCK is set, all zooms into a subroutine are denied. If a PERMANENT EDIT LOCK is set, all attempts to edit the block are denied.

Caution

The permanent locks differ from the regular VIEW LOCK and EDIT

LOCK in that once set, they cannot be removed.

Once a PERMANENT EDIT LOCK is set, it can only be changed to a PERMANENT VIEW LOCK. A PERMANENT VIEW LOCK cannot be changed to any other type of lock.

GFK-0467K Chapter 2 System Operation 2-37