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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!


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

    good topic.

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

      [FUN(49) 0 0 #1234] not found

      August 13, 2015 at 10:04 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
  • mohamad says:

    Why after entering the wrong password 5 PLC is locked

    April 6, 2015 at 2:08 am
  • Eslamy says:

    dear sir
    I have a plc CQM1H CPU51
    I entered the wrong password several times but now inter the correct password not unlocked
    I request you
    Please help me to solve this problem
    I look forward to hearing from you.tank you for your consideration
    thank you

    April 7, 2015 at 5:39 pm
  • plcvn says:

    Let the power on and wait at least 2 hours before entering the password again.

    April 7, 2015 at 7:32 pm
  • palinda says:

    i haven’t found [FUN(49) 0 0 #1234] . can you help me

    August 13, 2015 at 10:03 am
  • palinda says:

    Dear sir,

    i have tried a lot time with FUN password protection method regarding omron CJ1M CPU. But unfortunately i was failed.
    Can you please be kind enough to tell me another method to set this password protection to my plc.
    Hope you will reply me ASAP.

    My email adress is


    August 13, 2015 at 2:12 pm
  • plcvn says:

    CJ1M don’t have FUN (49), you must set password in CX-Programmer.
    I have sent you the email with the instruction.

    August 13, 2015 at 2:27 pm
    • palinda says:

      thanks your help

      but I need lock my plc after 1hour later. ( when I was unlock plc and need automatically lock plc after one hour ) help me

      August 14, 2015 at 9:42 am
  • Doctor_doom says:

    Dear sir,

    Could you please share method to set password protection to plc Omron.
    I also tried to unlock cj2m ( and cj2H) with FUN49 and failed.
    Hope you can sent me the email with the instruction.

    My email adress is

    Thank you,

    August 20, 2015 at 9:30 pm

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