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Old 07-12-2019, 07:43 PM   #1
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I've been using an AB PLC 5 to do home automation ( lawn sprinklers, pool filter etc. ) for a few years.
Eventually when I can no longer find a computer with an ISA slot to fit my "computer to PLC" interface KT card I will have to move on to a different PLC.

If anyone could suggest which one might be appropriate I would appreciate it.

I've been looking at a Koyo D06, I'd like to stay with A-B but I don't want to spend a fortune on software.
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Old 07-12-2019, 08:47 PM   #2
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Originally Posted by JerseyJoe View Post
I've been using an AB PLC 5 to do home automation ( lawn sprinklers, pool filter etc. ) for a few years.
Eventually when I can no longer find a computer with an ISA slot to fit my "computer to PLC" interface KT card I will have to move on to a different PLC.

If anyone could suggest which one might be appropriate I would appreciate it.

I've been looking at a Koyo D06, I'd like to stay with A-B but I don't want to spend a fortune on software.
plc 5 used Ethernet side card or usb2 to isa card will get you another few years out of the old stuff
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Old 07-12-2019, 08:52 PM   #3
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Micrologix if you aren't looking for a modular PLC system. Most can take expansion cards. The software was $150 from the supplier when the last place I worked bought it. Depending on the model AB did have a light version that was functional for free on their site, no clue if it is still available or not. It did have limited functionality though.

Oh if you go with a micrologix, get one with ethernet and you'll never have to worry about coms for quite some time.
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Old 07-12-2019, 08:52 PM   #4
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could you elaborate on the usb to isa card
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Old 07-12-2019, 09:19 PM   #5
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MicroLogix 1000 and 1100 can use RSLogix Micro Starter Lite (free). Higher trims require RSLogix Micro Starter ($150) or RSLogix Micro Developer ($540). Differences between the two paid versions can be found here:

https://rockwellautomation.custhelp....ix500Micro.pdf
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Old 07-12-2019, 09:27 PM   #6
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AB micro800 series.

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Old 07-12-2019, 09:31 PM   #7
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Why would someone go from plc 5 to micrologix? Get something slightly newer.
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Old 07-12-2019, 09:47 PM   #8
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Why would someone go from plc 5 to micrologix? Get something slightly newer.
Because they can be had reasonably cheap and if you get the correct one the software may very well be free... Plus, if he is still using a PLC5 he doesn't much care about being current...
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Old 07-12-2019, 10:02 PM   #9
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no need to be current, just want to keep my stuff going, thanks everyone for the replies
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Old 07-12-2019, 11:29 PM   #10
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Use the serial port. First option is use a usb to serial dongle.

Second is you can get serial to Ethernet adapters. These are clever in that you install a driver on your PC. It creates a virtual serial port but the actual port is in a little box hooked to the PLC. An additional advantage is you can do this all inside a virtual PC so hardware limitations and operating systems no longer apply to you.

Third and much cooler is the Digi One IAP. This one is actually a protocol gateway. So your old PLC-5 appears with an Ethernet port where multiple devices can talk to it. If I recall the IAP has two serial ports so an existing HMI can still “see” it transparently. It can also allow for instance Modbus access to/from the PLC5 significantly extending its life.

Fourth is pay me decent money for my last remaining 5/40E, backplane, and IO cards all 32 point style.

Micrologix is still current. I’ve been told when Microsoft drops 32 bit support that’s it but so far it has not happened yet. Plus all my PLC software is virtualized so I don’t care if Microsoft ever dumps 32 bit support. Too many compatibility issues to run PLC software “naked”.

But if you are jumping ship from PLC5 anyways I can suggest a couple options. Softplc is the old PLC5 programmers. It looks, smells, and acts like a PLC5 because it is. Trouble is it isn’t all that popular.

So switching to Toyo hands down they are the price leader and very well supported. Toyo has been around for decades. The GE series 6 PLCs from the 1990s for instance are Toyo PLCs. I’d suggest staying current and looking at Do More, Click, or Productivity, depending on IO and networking needs. DirectLogic is getting long in the tooth and probably will suffer the fate of Micrologix.

Compared to PLC 5 the math functions on Toyo are much better, the ladder logic is a fixed “grid” like the 6200 days (works identical but a pain to edit), and the timer functions just plain suck. The subroutines, tasks, etc. are similar to ControlLogix and much better than PLC5 days. It’s compiled too so speed is definitely improved even on Clicks. Networking is industry standard Modbus and Modbus/TCP instead of goofy poorly supported protocols or putting out standards only to ignore/subvert them like AB does.

I know both systems pretty well. If I picked one for home use Toyo wins hands down. Prices are so much more reasonable and although the programming system has some disadvantages, it’s not terrible.

Micro 800 is a Codesys PLC. But it’s not just a European PLC. A little more primitive than Koyo and has more screwy idiosyncrasies and really oddball limitations. AB purposely put in limitations so that it won’t threaten the CompactLogix market. It is purposely designed to go nowhere. At least Koyo is trying to make money.


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Old 07-12-2019, 11:35 PM   #11
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Micro 800 are doing exactly what they were designed to do. Provide cheap way to write logic. Not too different from a click IMO.

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Old 07-13-2019, 06:22 AM   #12
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could you elaborate on the usb to isa card
Its a cheap converter that allows you to add a ISA card to any computer via the usb2 port.
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Old 07-15-2019, 06:12 PM   #13
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A-B Micro800 is programmed with Connected Components Workbench software that is free.
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Old 07-15-2019, 07:50 PM   #14
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A-B Micro800 is programmed with Connected Components Workbench software that is free.
And should work fine for what he does.

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