Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: derekbpcnc on September 25, 2010, 06:55:43 AM

Title: Opto Isolator board
Post by: derekbpcnc on September 25, 2010, 06:55:43 AM

Hi All,

I'm at last working on getting a Duplomatic turret working and fitted to my Colchester CNC lathe.

I'll be using a PLC to handle the turret with a simple 6 wire handshake to Mach via a Pokeys I/O board.
4 BCD for tool number
2 back to mach for tool in position and error (maybe 1 or 2 more I/O depending on how things go), but is is a basic system using the KISS principle ;D

So the question is, I'm looking for an opto isolator board to go between the 5vTTL (3.3v) of Pokeys and the 24v of the PLC
I've see the PMDX-105 (I'll need 2 of these) but are there any other options? I could do a DIY, but rather buy something off the shelf to speed things along.

ATB
Deker

Title: Re: Opto Isolator board
Post by: Hood on September 25, 2010, 07:01:28 AM

Does your PLC  have Modbus? If it does then no need for all the wires to PoKeys, just have them to the PLC, the ladder will do the work and signals sent to Mach via Modbus.

Hood

Title: Re: Opto Isolator board
Post by: derekbpcnc on September 25, 2010, 07:29:53 AM

Hi Hood,

Afraid not, its a mitsubushi FX, so descrete IO is the only way. I also want to use the pokeys for analogue overide for feed and spindle rpm etc. and maybe MPGs if that works now.
PLC was a freebee.

ATB
Deker

Quote from: Hood on September 25, 2010, 07:01:28 AM

Does your PLC  have Modbus? If it does then no need for all the wires to PoKeys, just have them to the PLC, the ladder will do the work and signals sent to Mach via Modbus.

Hood

Title: Re: Opto Isolator board
Post by: Hood on September 25, 2010, 08:06:59 AM

Shame :( afraid I dont know of anything so hopefully someone else will.
As for PoKeys and MPG, I think its a case of step mode is fine for MPG but Velocity mode its not.

Hood

Title: Re: Opto Isolator board
Post by: arturod on September 25, 2010, 10:14:38 PM

Derek,

If you want to use +24vdc logic on your parallel port, you may consider the C31:http://www.cnc4pc.com/Store/osc/product_info.php?cPath=33&products_id=245. If you need to use +24vdc logic on the pokeys, we got a couple of boards that handle +24vdc logic for the pokeys: http://www.cnc4pc.com/Store/osc/index.php?cPath=54.

Please do not hesitate to contact me if you require further assistance.

Thanks,

Arturo Duncan
http://cnc4pc.com
   

Title: Re: Opto Isolator board
Post by: derekbpcnc on September 26, 2010, 07:20:30 AM

Hi A

Hi Arturo,

I need to wire to the pokeys terminals so the Emulators » M27 and M28 look like the ticket :-)

I guess I will have to cut one end of the ribon cabe to wire into my pokeys 66T terminals?

ATB
Deker

Quote from: arturod on September 25, 2010, 10:14:38 PM

Derek,

If you want to use +24vdc logic on your parallel port, you may consider the C31:http://www.cnc4pc.com/Store/osc/product_info.php?cPath=33&products_id=245. If you need to use +24vdc logic on the pokeys, we got a couple of boards that handle +24vdc logic for the pokeys: http://www.cnc4pc.com/Store/osc/index.php?cPath=54.

Please do not hesitate to contact me if you require further assistance.

Thanks,

Arturo Duncan
http://cnc4pc.com
   

Title: Re: Opto Isolator board
Post by: arturod on September 26, 2010, 09:02:05 AM

Derek,

Yes, you can cut the ribbon cable and wire the ends to the PoKeys terminals.  But wiring so many I/Os with it’s commons can become very messy.   That is one of the reasons why using the PoKeys core and mother board can be a good idea.

Arturo Duncan
http://cnc4pc.com