what is M code used for in QD75MH2?

[quoroy]

What is the M code is used for in positioning servo-motors? There's a parameter setting in the QD75MH2 for M code but I don't know what they're for and what the diference from the Data No. is.

[Veganic]

Data No. are commands to the servo drive?

M codes are a "reply" from the servo controller that are on either during or on completion of a positioning event, depending on the set-up.

[quoroy]

what instruction do I use to read that M code reply ? thanks.

[Veganic]

It is just set in the PLC if I recall correctly, so if you set it to be M700 the just check the status of M700.  

[Veganic]

I think I may have misinformed you.  The M code may be written to a data register.  I'll dig out an old program and verify this.

 

[quoroy]

Thanks, I already checked it, it's written to the buffer memory of the position module. For example U6/G808 and then I can just move it to a register.