Re: [CAD_CAM_EDM_DRO] ServoToGo opto isolation

> From: emserv@...
> Iam almost ready to connect the STG card into the amps,encoders,etc.
> on my Matchmaker mill.The STG hardware manual states that the board
> is OPTO-22 compatible , but Iam not sure which I/O`s need isolation
> and how to go about it,any information would be greatly appreciated.
> Thanks ,Jim.

What they mean by OPTO22 compatible is that the pinout of the 50 pin digital
I/O connector (P1) is such that a standard ribbon cable can be run from there
to an OPTO22 board such as the PB24 or the more modern G4PB24. The D/A
outputs and encoder inputs of the STG card should be connected directly to
the servo amps and encoders. Whether any of your limit or home switch inputs
need to be isolated will depend upon what the whole circuit looks like. For
example, if the limit switches are connected to the servo amp's + and -
inhibit inputs, and you also want to connect them to the STG card inputs, you
can use G4 DC input modules to interface the high voltage (15Vdc or 24Vdc
usually) limit switch signals with the TTL level inputs of the STG card.

Sketch up your schematic, and maybe we can fill in the blanks if this
explanation doesn't completely solve your problem.

Matt