Very, very fair point. Intrinsically safe.
Going back my example of using 2 relays as digital control inputs to an H-bridge driver - might make sense here. In the off chance that it might help anyone, below is a link to the PCB that I made for the XOR logic and driver. Designed for 24V and 12V is probable the lower limit. Happy to share source files (Diptrace) with anyone that might want to tweak it for their own purposes.
https://oshpark.com/shared_projects/bBpLCCz5
Taking a wild swing here, but could this be set with something like "Basic Z-Wave Tool"? I haven't really played with it much and do not necessarily advocate for such a solution.
I spent part of this morning updating my firmware from v1.01 to v1.03 ... but needed to get the device back to its day job.
Yes, it certainly could. But...
Duly noted that this might not be ideal for every situation. Just making sure to capture what can be for the sake of posterity - the folks that come here on some related search term.
I'm not fond of control systems that don't present their own safety interlocks.
I have a multi-relay door controller application/driver that I wrote. Even though I advertise that the individual relays are expect to provide auto-off relays, I also include interlocks in the application code. It works about as well as something attached to a radio can, but I would never depend upon those interlocks if failure meant a fire. 
The door controller it manages, an INMOTION, provides its own hardware based interlock as well to prevent motor burnout.
I ordered my zen-16 and believe that I can get my mechanical relay interlocks in with 1 DPDT relay and 3 SPDT relays. The DPDT relay will act as my reversing switch. One STDP relay will cut all power to the motors when R1 and R2 are not energized. And the last 2 relays will cut control power to the other relays. I will post a drawing once I get it working but it may be a few days I don't have the parts yet.
Am I also to assume that the switch inputs to the relays are directly wired and don't rely on zwave to work?
Correct. Z-Wave is required to configure the ZEN16, but once configured Z-wave is not required to operate the relays using the built-in switches. @agnes.zooz can confirm.
Confirmed! The inputs on the ZEN16 are fixed to the outputs so a switch connected to the Sw terminals will always trigger the load connected to the R terminals, even if the device is not added to Z-Wave.
@bcopeland any chance we can get the driver updated for the ZEN16 that will include the new parameters and garage switch mode added in firmware 1.03?
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