It may not be the most economical solution, but this is why I oftentimes include a PLC in the CNC control cabinet. I can mix and match I/O and drive it via Modbus RTU or TCP and be done with it. If you want to use the logic in the PLC you can. If not just use it as a dumb I/O brick/block with your choice of I/O. A lot of PLCs are floating around on Ebay for dirt cheap prices. By the time you buy an opto 22 block, mounting strip, and individual blocks you can buy an entire PLC. The Automation Direct PLCs over here have Modbus RTU ports even on the new $69 units and now they have a PLC with Ethernet built in for a little more.
Dave On 1/22/2016 9:35 AM, Ralph Stirling wrote: > I like using DR-ODC24 and DR-ODC5 optos. I use the > ODC5 for output and the ODC24 for input. The DR types > have din rail mount and screw terminals on the top, plus a > little fuse for the output side. Prices vary wildly on ebay for > them, but there are lots of suppliers. > > -- Ralph > ________________________________________ > From: John Thornton [j...@gnipsel.com] > Sent: Friday, January 22, 2016 6:25 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Not as useful as I thought > > Do you need some kind of special base for the OPTO-22's? > > JT > > On 1/22/2016 8:06 AM, John Kasunich wrote: >> On Fri, Jan 22, 2016, at 05:08 AM, andy pugh wrote: >>> I was having trouble sleeping last night, I was obsessing about CNC >>> machine wiring. >>> In an attempt to break the cycle I went on eBay and bought >>> http://www.ebay.co.uk/itm/291551363807 >>> >>> In the cold light of day I think I made a mistake. >> Too late to return it? >> >>> I wanted to control the two clutches and the brake on my lathe >>> gearbox. These have a single wire to a brush (24V) and return via the >>> machine frame. >> Why not individual SSRs? >> >> http://www.ebay.com/itm/181975200040 >> >> (Full disclosure - I'm selling those, as well as many other types, input >> and output, AC and DC. But there are many other sellers, and I'm >> sure some are in the UK.) >> >> >> > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
