I'm reading it as it has Ethernet, USB and DB25 as inputs and outputs go out the 9 pin serial direct to the stepper drives ?
If so and it can use USB or Ethernet why a BoB ?
Documentation isn't very clear.John S -
Although this bit implies its output is the same pinout as the parallel port:
The branded software enables one to use the I/O ports of the
controller in MACH3 instead of computer built-in LPT ports. If you
were earlier using a computer LPT port to connect drivers, you will
need to disconnect the connector from the computer LPT port, connect
it to the PLCM controller and install the appropriate plug-in
Each controller has at least one port completely matching the
physical LPT port.
Still not liking mainly the lack of information about the interface/software/drivers but also the 100KHz limitation and only being compatible with Mach3.
Last edited by Jonathan; 01-05-2012 at 09:59 PM.
It worked before you plug it in so why ?
100KHz isn't any worry for me as I still use the base frequency of 25Kh, plenty fast enough at my age dick slapping is no longer an art form.
Again Mach suits me, it works and you don't have to be a geek to use it.John S -
I think having and operating CNC machines already qualifies us as geeks so it's a bit late for that. I had a couple of unresolvable problems with Mach3 last week, so I promptly switched to LinuxCNC. No regrets.
So if you have already built your box and you plug this in between what do you achieve except a hole in the wallet ?
Of course, if you absolutely satisfied with how do your CNC system works, you don't need PLCM.
But in most cases, due to PC motherboards' hardware issues, MS Windows and Mach3 architechture, output freq. on pins of PC's LPT-port is very unstable.
Who have such possibility - just use your oscilloscope to check this.
So, this causes a) step missing b) limiting maximum of speed and torque.
You can check this video: www.youtube.com/watch?v=3Gi2B2qUJ_k
This test shows that no-load max. rotating speed higher up to 40% with PLCM.
Also, there are one issue in mach3 with late changing DIR signal.
Also, i think most of Mach3 users know, how sensitive it is to Windows interrupts. Suddenly started screen-saver can make the part you're processing now into the garbage.
You can also check first question in our FAQ.
Last edited by Purelogic RnD; 02-05-2012 at 05:07 AM.
Sorry still doesn't explain what it does.
Simple question? Can you connect to a computer via USB or ethernet and run the stepper drivers off your board. I.E. like the smooth stepperJohn S -
02-05-2012 #17Simple question? Can you connect to a computer via USB or ethernet and run the stepper drivers off your board. I.E. like the smooth stepper
but, also like a smoothstepper, it's still need a bob.
Last edited by Purelogic RnD; 02-05-2012 at 07:59 AM.
1) receive and buffers trajectory info from Mach3 by USB or Ethernet.
2) Process this info, transforming it to STEP/DIR/ENABLE pulses, generate them on it's "out" pins
3) receive and process signals from "in" pins
You just connect your BOB or multichannel driver to PLCM(using DB25 cable), PLCM to PC.
So, using motion controllers you decrease load on PC's CPU, system become insensitive to Windows interrupts, you get stable impulses on pins(motors rotates more smoothly) and so on.
Last edited by Purelogic RnD; 02-05-2012 at 08:05 AM.
OK got it now, my bad I was getting confused with a picture I had seen of your breakout board and thought the PLCM-E3 had plugs on for the stepper drivers.
Looking at the PLC4X BoB, do you have a manual in English ?
Also you have PP port on one end and 9 pin serials on other side.
Why not fit screw connectors to the board instead of 9 pin serials, seems messy having to use the extra connector boards just to get cables out ?John S -
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