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mfPLC · Posted: 25/03/2020 18:39 Post subject: Omron CP1H Write protect

Hi,

I recently had to buy a batch of new electrical components containing

10 PLC Omron Type (CP1H-X40DRA) Apparently stored in store (to be used as spare parts).

And when we check them, I see that they are in perfect condition and that they are already programmed for the applications for which they are intended, which did not interest me since I intended to use them for my own applications.

To my surprise, I see that I cannot download my program because of the write protection (by checking of course that the DIP SWITCH n˚1 is OFF)

The following message appears on CX Programmer on each attempt:

Erasing program memory failed.

The program memory may be protected in read mode with prohibition of erasure.

I understand of course that we have the right to protect a program against reading or modification, but here to condemn the PLC that we bought and to prohibit the reuse of hardware is something that seems unfair to me!

I also doubt that maybe it was I who did not know how to reset the PLC for my own use (Despite my research on the specialized Forums).

Please enlighten me on the matter or guide me how to remedy this problem. I can go online and see the status of AR99 (Relative to read / write protection)

AR99.00=1: UM read protection is set

AR99.01=1: Task read protection is set.

AR99.02=1: Overwriting prohibited (write-protected)

AR99.03=0: Creation of backup program file allowed

Thanks for help

sflkmq · Junior Joined: 05 Oct 2018 Posts: 7

Have you tried to go online with PLC, set it in program mode and select "Clear All Memory Areas" from CX programmer checking the box "Initialize".

mfPLC · Posted: 26/03/2020 13:29 Post subject:

I've already done it
The response is :
failure to erase the entire memory area

Thank you