Program Operation Protection Using Production Lot Numbers - Omron CJ2 CPU UNIT SOFTWARE User Manual

Auxiliary Area Flags and Bits related to Password Protection
Name
UM Read Protection Flag
Task Read Protection Flag
Program Write Protection for
Read Protection
Enable/Disable Bit for Pro-
gram Backup

10-6-3 Program Operation Protection Using Production Lot Numbers

The program can be protected against operation by using the production lot number stored in words
A100.01 and A100.02 of the Auxiliary Area. The production lot number cannot be changed by the user.
• The production lot number is six digits. The leftmost four digits are stored in A100.02 and the right-
most two digits are stored in A100.01.
Production lot number (6 digits)
A100.02
Example of Production Lot Number Storage
Production date
June 20, 2008
CJ2 CPU Unit Software User's Manual
Bit address
A99.00 Indicates whether or not the PLC (the entire user program)
is read-protected.
OFF: UM read protection is not set.
ON: UM read protection is set.
A99.01 Indicates whether or not selected program tasks are read-
protected.
OFF: Task read protection is not set.
ON: Task read protection is set.
A99.02 Indicates whether or not the write protection option has
been selected to prevent overwriting of programs.
OFF: Overwriting allowed
ON: Overwriting prohibited (write-protected)
A99.03 Indicates whether or not a backup program/network symbol
file (.OBJ file) can be created when UM read protection or
task read protection is set.
OFF: Creation of backup program file allowed
ON: Creation of backup program file prohibited
Always 0
0 0
A100.01
Production lot
A100.02
number
080620 0806
10 CPU Unit Functions
Description
A100.01
2000
10
10-55