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How to set password for Omron C-Series (CPM1A/CPM2A/CQM1/CQM1H/C200H*/…)

Perhaps you will wonder how to set a password to protect your program.

You’ve read all of Omron manuals but no mention of this.

Do not worry, I will tell you

At the first location of the program (row 0, column 0), you write a normally open contact with AR10.01 address, followed soon after is instruction FUN (49) with parameters respectively 0, 0, # 1234. With 1234 is the password (for example).

0,0 |——-|AR10.01|————————–[FUN(49) 0 0 #1234]

Note that you must not insert any contact or instruction between A10.01 and FUN(49) Password only work when turn the power off and then turn it on again or if you want it works immediately, select command from Menu -> Protection -> Set Password.

After you have set your password, in order to do online edit or read (upload) the program from PLC, you have to unlock: from the PLC Menu -> Protection -> Release Password and enter the password that you have set to unlock.

Good luck! (2861)

Category: Omron, Tutorials
Tag: ,
  • tommy says:

    good topic.

    August 13, 2012 at 11:36 am
  • plcvn says:

    If you need the software to unlock the password for these PLCs, send an email to

    September 23, 2012 at 9:18 pm
  • letranlong says:

    please hepl me upload plc omron CPM1A
    I have a question for your
    i hepl everyone help me
    i have a types plc omron CPM1A and CPM2A, i when upload programs data all in plc but me upload being error
    i have a question for your help, i have found errors when i upload plc omron CPM1A and CPM2A but programs plc being unlock password . those errors are shown that i send attach image.
    could you help
    please. for me a software to fix opening password plc omron.
    what is software opening password plc omron CPM1a and CPM2A?
    please. can you give me a link ? I to fix open password plc omron
    thank you so much for your time and consideration.

    July 16, 2014 at 1:48 am
  • plcvn says:

    No attachment found. So in order to help you, please write the error message.
    The software SYSWIN or CX-Programmer can be used for CPM1A, CPM2A.

    August 20, 2014 at 12:34 am
  • Juan Manuel Ferro says:


    I have a machine that works with Omron CPM2A plc
    the machine was made in 2002, I asked the manufacturer but they do not
    have this PLC program backup. The machine is working fine and the PLC is OK
    I only want to do a PLC program back up just in case there is a PLC
    CPU damage, so with the PLC program back up I can download to a new
    PLC CPU.
    Can you give a help on how to unlock the password?

    October 30, 2014 at 9:37 pm
    • plcvn says:

      If you want to back up the program in binary code and restore to new plc only, for C-Series, no need to know password. Omron have a program to back up and restore the program and memory. Contact me if you need.

      If you also to upload and view inside program, you must have the password. If you want to do this, you can buy the service on the store of this website.

      October 30, 2014 at 9:43 pm

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