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  1. #1
    Join Date
    Nov 2009
    Posts
    4

    Exclamation 21 system error

    21 system error, no comunication between pc and nc
    after replacing battery and clearing MRJ-2 This fault came up,

  2. #2
    Join Date
    Nov 2009
    Posts
    4

    Exclamation 21 system error MAZATROL 640M

    Anybody familiar with this fault??

  3. #3
    Join Date
    Jul 2007
    Posts
    284
    What is the exact alarm you are getting? Is it a windows alarm or are you getting this on the alarm diagnosis screen?
    Did you replace the battery in the NC or the MR-J2? What do you mean you cleared the MR-J2? Did you reload the parameters to the MR-J2?

  4. #4
    Join Date
    Nov 2009
    Posts
    4
    Quote Originally Posted by onthebumper View Post
    What is the exact alarm you are getting? Is it a windows alarm or are you getting this on the alarm diagnosis screen?
    Did you replace the battery in the NC or the MR-J2? What do you mean you cleared the MR-J2? Did you reload the parameters to the MR-J2?
    21 system error is always in the screen, But when I was looking around i went to the MR-J2 and as soon I get in, a message came up "PC-NC_I/F_ERROR" then down this, "[IMG]![/IMG] The read error occurred between the NC and the personal-computer. 0001" I close this message and another came up,
    "Communication error between personal computer and the servo amplifier, Check Connection."
    Then I closed this one and another window came up,
    "SPECIFICATION CHECK FOR CONNECTED MR-J2-CT"
    It can not distinguish between the Rotary Axis and the Linear Axis, For communication error. Wich do you want to connect the Rotary Axis or the Linear Axis?.

  5. #5
    Join Date
    Mar 2005
    Posts
    988
    Error 21 is a software alarm and it may be because one or more of your MR-J2s lost its mind. I'd reload the MR-J2 parameters like onthebumper mentioned.

    What machine is this? and how did this all originally start?
    It's just a part..... cutter still goes round and round....

  6. #6
    Join Date
    Jul 2007
    Posts
    284
    Also check the MR-J2 drives. They should be flashing some alarm on them. If they are blank or have a solid display when the NC control is on then one of the drives is bad or you have a communication problem to the drives.

  7. #7
    Join Date
    Nov 2009
    Posts
    4

    21 SYSTEM ERROR

    The problem was in one of the MR-J2 drives, Someone changed a switch that is on the front of the drive, The LED screen in the front of the drive has to digitals numbers and on the right side has a switch with numbers (0 to 10) and letters (A to F), I have four drives and none of the drives can't have the same number, so two drives were using the same number(2), I have to go to the MR-J2 and check the axis settings and give them the right number. I WANT TO GIVE THANKS TO EVERY PERSON THAT TRY TO HELP ME,THANKS ALOT

  8. #8
    Join Date
    Mar 2009
    Posts
    4

    Mazak 640M System Error 21

    I see you have fixed your problem.

    But just to add,
    we had the same issue, thou it was actually our Hard drive that had failed.

    take care!

  9. #9

    Re: Mazak 640M System Error 21

    Guys, I'm having the same issues on the Mazak integrex 300 640..Where exactly is the MJ-J2 driver located? Please help!!

  10. #10

    Re: 21 SYSTEM ERROR

    Hi guys, I found out one of the MRJ drives is bad, showing solid number 88. What is it mean? and how do I fix it? Do the batteries need to replace? @ MR-J2-200CT

    Any input would help, please.....

  11. #11
    Join Date
    Sep 2017
    Posts
    139

    Re: 21 SYSTEM ERROR

    This is related to memory error. Try initializing the drive unit. If it doesn't work then the drive control card needs to be repaired

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