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Yes it's very odd Moray, and try as I may I can't at the moment see any way of getting further segments.

Looking at the guide to programming the PLC most, but not all, of the FB function blocks listed in the PLC directory are standard ones that do things like transferring data to and from the PLC and NC parts of the controller.

It all looks pretty shell like and empty if I'm honest, and it's really odd that the one FB that looks OK to my untutored eye, is FB_99 for the non-existent W-Axis.

I'm trying to formulate a concise but meaningful question for the Siemens forum about this - they are an odd lot, and the moderators tend to kick things into touch if you are not careful how things are phrased and ramble too much! It's a question of getting all the graphical information into the single picture that they allow !

When the controller is loaded from an empty state you start loading NC Data and PLC Program and data, but then there is an 'ASM' file that no-one can explain what  it is, but I strongly suspect that it is compiled assembler code - the only reference to it I've found calls it a 'dump of user memory'.

I'm tempted to do a reload without the ASM file, and try and go on line to the PLC and see what's in it. If the ASM file IS compiled  assembler code for the PLC then surely the PLC program has to hook into it to use it at various points, and I see no sign in the 'Blocks' I've downloaded.

It's no tiddler at 207Kbyte and takes 30 mins to load !
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by mc on Today at 11:03:51 AM »
PB202 looks very suspect, given it should be far longer compared with the rest.

The thing that stands out to me, is what's the significance of the Segment 1 on all the screens?
Is there some way to access more segments?
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Project Logs / Re: Sheet Metal Brake and 3d Printer.
« Last post by WeldingRod on Today at 09:47:13 AM »
Once your bot is running properly, overnight prints aren't a big deal.  You might want to add a filament run-out sensor; my last epic print took about 48 hours and spanned three rolls of filament.  If it runs out and the bed hasn't cooled, you can just stop it, pull the SD card, lower the head till it just touches the last extrusion, and delete everything from the gcode file before that layer height, then tell it to print.  That way you keep the zero point!

Cable chains are CRUCIAL to long term printing; glad to see you fitting them!  You have to be sure those dratted wires don't get caught!  Yes, straight chains are MUCH easier to thread.  Use fine stranded wire in them, BTW!

I run mine in the same orientation you are using.

I highly reccomend having a spring loaded build plate.  That way if you crash into it it can move away and maybe not booger up stuff too bad.  Ask me how I know...   https://madmodder.net/Smileys/default/confused0068.gif

My brain and power supply lives in the left corner of the base frame.  You can slip a piece of fiberglass in on top of the base cross bar and screw it down to create a cavity that is partially isolated from the hot cavity.

Mine has feet screwed into the bottom of the Z rails that raise it a bit.

I think I've posted pictures of the Z before, but here's a fresh one.  I had the X and Z cable chains as one continous chain, but connected backwards at the X/Z junction so they bent the other way.  The flip happens at the one with the "X" on the side.  The end of the Z chain is a leftover plate that I bent to shape.  I might have had a few laying around ;-)
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To illustrate this conundrum I'll post some screen shots of some of the blocks in the PLC as downloaded by STEP5

First the Directory - (it was one line longer than a screen so I cut and pasted it !)

Then OB 1 which is the entry point for the program
Then OB 2 which is called on interrupts (and only seems to call the FB 99 W Axis routine)
Then PB 202 which should be the main program block
Then a couple of function blocks (FB11 & FB 60 as examples of 'no meat'
Then FB 99 the W axis service function that isn't used but is meaty !!!


There just HAS to be more to the program than this trivial bit  :scratch:
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Project Logs / Re: Sheet Metal Brake and 3d Printer.
« Last post by WeldingRod on Today at 09:31:21 AM »
Here's the bottom plate of the print carriage

Sent from my SAMSUNG-SM-G891A using Tapatalk

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You may have changed the loading on the rs232, which could be helping some sort of voltage/reflection issue...

Sent from my SAMSUNG-SM-G891A using Tapatalk

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This morning I set off with the good intention of getting STEP5 to start downloading block "FB11" and timing with a stop watch when it failed (this is the block that previously had consistently given "Last Segment Not Completed") My intention being to monitor with the Logic Analyser and look at the interactions at about the time of the failure.

To my great surprise the block down loaded error free !

OK on a roll I decided to download the one other block (PB202) that previously had locked everything up and caused STEP5 to crash the operating system - sure enough it whistled through error free - very very odd. I've left the interface settings as STEP5 has modified them on the PC, but the 820T controller is still set up 'as was'

So PC set to  9600/Even Parity/8 data/2STOP/XON=off/CTS=off/DSR=off/DTR=on/RTS=on
  820T set to  9600/No Parity/8 Data/2 Stop/XON=on/CTS=off/DSR=off/DTR=off/RTS=off

No idea why this is now working - but it is!

But the very odd thing is that when I look at the various 'Program Blocks' and 'Function Blocks' there is just not enough 'meat' in them to be the complete PLC program - the only block with any substance is the one that seems to control the 'W-Axis' which is not even used on this lathe.

So something is missing somewhere - there must be a back door into this PLC thingummybob that I've not found.


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Project Logs / Re: Mini mill Stand SX2 Plus
« Last post by Brass_Machine on October 18, 2018, 10:32:43 PM »
Looks good. There is a huge thread over at cnczone about using an epoxy/granite mix as fill...

Eric
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The Water Cooler / Leveling spot for new small shop.
« Last post by Doc on October 18, 2018, 08:30:03 PM »
My wife out helping move dirt and level out a spot for a small electric repair shop I'm planning.
It will be for repairing alternators, generators (auto type) starters  and some types of motors.


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Project Logs / Re: Sheet Metal Brake and 3d Printer.
« Last post by S. Heslop on October 18, 2018, 06:14:07 PM »
D'oh!  I forgot the attachments are on top!  Yeah, you want the top level!

The bottom plate is for the z zero prox.  I'll take a pic tonight.

Mine has been cranking on a print for two days straight, after the first 36 hour print finished...  full scale, here I come!

Sent from my SAMSUNG-SM-G891A using Tapatalk

I'm really dreading those multi-day prints. I was dreading them already but reading about electrical fires from all the strange high amperage Chinese boards made it worse!


Got two of them drag chains in. Of course they gotta come back out for me to have any hope of getting the cables through. I'll probably tie them to a thin steel rod and drop that through.



One to go. Just figured out where i'm gonna squeeze it. The machine is oriented as is for easier access to the interesting parts, and I figured i'd have it rotated 90 degrees in the end since that Y bar gets in the way. But I neglected to notice till now that the belts also get in the way. So as it is is probably the best orientation for easy access to the parts.

It's also interesting, to me at least, that the end pieces of this cheap drag chain is more what I anticipated - but the chain itself is made from a very tough glass filled plastic.


Finally, I need to consider how i'm going to house the electronics. I could slide a board into the upper groove on the base extrusions, and have a compartment isolated from a potential heated chamber in the future. But that won't give easy access to the electronics. And speaking of fires...

Maybe I could put a board in that groove, but also stand the whole thing on some 50mm tall stilts, then mount all the electronics to a tray that can drop and slide out.


Anyways either way, hopefully tomorrow i'll have it wired up and ready to blow some stepper drivers!
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