407
Program Protection Section 6-7
Usage
Apply read protection to tasks when you want to convert those task programs
to “black box” programs.
Note 1. If the CX-Programmer is used to read a task with task read protection ap-
plied, an error will occur and the task will not be read. Likewise, if the PT
Ladder Monitor function is used to read a password protected task, an er-
ror will occur and the task will not be read.
2. The entire program can be transferred to another CPU Unit even if individ-
ual tasks in the program are read-protected. The task read protection will
remain in effective for the password-protected tasks.
3. When the CX-Programmer is used to compare a user program in the com-
puter's memory with a user program in the CPU Unit, password-protected
tasks will be compared too.
Restrictions to Function
Block Use
Function block definitions can be read even if the entire program or individual
tasks in a program containing function blocks are read-protected. If required,
set read protection individually for each function block.
Prohibiting Backing Up
the Programs to a Memory
Cassette
Overview
When a password is set for the entire user program or for a task from the CX-
Programmer, prohibiting backing up the user program can be set as an option.
Doing so will make it impossible to upload PLC data to the CX-Programmer
and make it impossible to save PLC data offline to a storage device.
Operating Procedure
1,2,3...
1. When registering a password in the
UM read protection password
Box or
Task read protection
Box, select the
Prohibit from saving to a memory
card
,
and transferring program from PLC
Option.
END
END
END
Task 0
Task 1
Task 2
Password applied.
Task converted to "black box."
Accessible
Not accessible
Accessible
When a password is set for the entire user program, or for one or more tasks,
backing up the user program (i.e., creating an OBJ program file) can be prohibited.
CX-Programmer
Password?
CPU Unit
A
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