E-Stop and EtherCAT drives going offline

My StepperOnline/LeadShine EL7 EtherCAT servo drives don't have a STO (safe torque off) feature.  Because of this, I have the servo drive AC power fed from a contactor that's part of the safety relay / E-Stop loop.  When E-Stop is triggered, the contactor cuts out and the drives will lose AC power entirely.  Unfortunately, these drives do not have separate power inputs for logic vs motor like I have seen on other brands.

I think this is fine from a safety standpoint both for humans and for the lifespan of the drives.  But this means the drives will drop off the EtherCAT bus and LCEC/LinuxCNC will lose their minds.  I'm not sure how recoverable this is beyond shutting LinuxCNC down and starting it back up after the emergency stop condition has cleared.

What approach have others taken to this scenario? 
 

These drives do have a common input so you can run 24v for I/O
Also you can define an input to respond to an estop signal to disable the drive.
Dropping mains power is not ideal. Some big machines cannot be allowed to coast to a stop.
You could add a timer relay so the drives were disabled and stopped before the power was removed.
But this should be built into the safety relay if you are building a standards compliant safety system.
Ethercat in general seems to recover OK once powered on again.