Servo MR-J4 - command position

[Beny236]

Hello,

    i have trouble with the servo axis  MR-J4. I changed servodriver from Incremental mode to ABS mode. The servo works normaly. Trouble is in Command position represented in PLC system. The command position is cleared to 0 after power ON. I need save the latest position on servo axis. It is possible see on attachement. I use PLC unit QD77MS16 and servodriver MR-J4. How is possilbe solwed this trouble.

   Thank you for the help.

      Best Regards

                      Beny

 

 

[Gambit]

You don't need to save the position, Just change the parameter in to ABS mode and make sure you have a battery mounted. 

[Beny236]

Servo is set in ABS mode and battery is mounted... but the possition is reseted after power off to power on.

[glavanov]

Might be a dumb question... after you change to absolute position system, did you preform HPR at least once?

After you power up the machine what is the Axis HPR Request flag status (MD.31 bit 3) and HPR Complete flag (MD.31 bit 4)

What do you mean by "command position"... current feed value?

 

[Beny236]

Hello,

    I  mean  "Axis12_Status.d_CommandPosition" is current feed value.