Help for servo drives

[Krr]

Hi!

I have a argument with one of my college...he sad it is possible to connect 2 servo motors (1S) with 2 servo drives but only one drive is connected to the PLC (NX1P2). One of the motors will be master and the second one will just follow the first one. He claimed he saw  this already once, and the master motor follows the slave one - just wiring the drives in certain way...I don't know how to do this. I'm almost sure it is impossible, but.... We need this, because we have PLC witch support 8 axes but we have 9 motors(changing the PLC is not an option). So is it possible to control 9 motors with 8 axes, and one of the servo drives is not even connected to the EtherCAT network?

Any help will be appreciated.

[Krr]

college =  colleague...for some reason I cannot edit the post

[pturmel]

You've been creating new posts for each change, due to tech difficulties on the site.  I'm deleting the other copies.

[photovoltaic]

Both drives need to be connected to the PLC via EtherCAT.

[photovoltaic]

I should add - with the the NX1P2 you may not have coordinated motion abilities. If the part number is NX1P2-9024XXX then you do not have coordinated motion abilities, just standard motion control abilities.

[Str8jCkt]

@Krr

Your colleague may be referring to the possibility of using PTO (Pulse Train) and sharing the output signal to multiple drives as long as you do not exceed the maximum output current. 

Perhaps like the old Yaskawa rebranded Omron SDGH drives or G5 R88D-KT drives.

 

I have also seen two stepper motors parallel on a single controller before to get extra/shared motion. Steppers can sometimes be done series or parallel depending on velocity or torque needs.

 

There are also some brand drives that have "index" modes that can possibly use shared commands as goto a position.

 

Not sure if any of those would be an option but always something good to keep in back of the mind for those rare cases.

[Krr]

Thanks all for the comments. I couldn't find any way how this could be done and I consider it as not possible.