Write Protection - Omron CP1L CPU UNIT - 06-2007 Operation Manual

Program Protection
6-7-2

Write Protection

Write-protection
Using the DIP Switch
388
The user program can be write-protected by turning ON pin 1 of the CPU
Unit's DIP switch. When this pin is ON, it won't be possible to change the user
program or parameter area (e.g., PLC Setup and routing tables) from the CX-
Programmer. This function can prevent the program from being overwritten
inadvertently at the work site.
It is still possible to read and display the program from the CX-Programmer
when it is write-protected.
CPU Unit DIP Switch
Pin
SW1 User Program Memory Write Protection
Confirming the User Program Date
The dates the program and parameters were created can be confirmed by
checking the contents of A90 to A97.
Auxiliary Area Words
Name Address
User Program A90 to A93
Date
Parameter Date A94 to A97
Name
ON: Protected
OFF: Not protected
Description
The time and date the user program was last over-
written in memory is given in BCD.
A90.00 to A90.07 Seconds (00 to 59 BCD)
A90.08 to A90.15 Minutes (00 to 59 BCD)
A91.00 to A91.07 Hour (00 to 23 BCD)
A91.08 to A91.15 Day of month (01 to 31 BCD)
A92.00 to A92.07 Month (01 to 12 BCD)
A92.08 to A92.15 Year (00 to 99 BCD)
A93.00 to A93.07 Day (00 to 06 BCD)
Day of the week:
00: Sunday, 01: Monday,
02: Tuesday, 03: Wednesday,
04: Thursday, 05: Friday,
06: Saturday
The time and date the parameters were last overwrit-
ten in memory is given in BCD. The format is the
same as that for the User Program Date given above.
Section 6-7
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