Re: [Emc-users] MESA 7i92H hiccup
On Mon, 27 Jan 2020, John Dammeyer wrote:
Date: Mon, 27 Jan 2020 14:02:12 -0800
From: John Dammeyer
Reply-To: "Enhanced Machine Controller (EMC)"
To: "'Enhanced Machine Controller (EMC)'"
Subject: Re: [Emc-users] MESA 7i92H hiccup
So I guess two questions.
1. If it happens again what type of diagnostics can I generate to see what
was happening under the covers.
2. Is there a way to clear it without opening up the cabinet and removing 5V
from the 7i92H (I guess a system power cycle would do that too without
opening the cabinet).
Thanks
John Dammeyer
My first guess would be a damaged I/O pin on the 7I92H (so marginal levels)
Peter Wallace
Mesa Electronics
Your suggesting mechanical? Not some sort of odd glitch that might occur in
firmware?
Yes, either electrical damage to the I/O or perhaps a mechanical
(connector/wiring) issue
A firmware bug is unlikely since you are not getting a following error
which means the hardware stepgen is getting the right commands and its position
count is correct. The hardware past the stepgen position count to the
step/dir outputs is pretty trivial so not much room for a bug there.
So if it happens again I'll put a scope on it. It's also possible the cable
from the 7i92H has issues and flexing it while cycling the power plug but
things back. But the cable into the 7i92H hasn't been removed for a while.
It's always the DB-25 end into the BoB that's used. But again could be cable.
In either case, is there a software way to reset it?
Yes, you can use mesaflash to do this:
mesaflash --device 7i92 --addr xx.xx.xx.xx --reset
I've got the bits and pieces to make a new cable that is the exact right length
so I'll do that later this week.
Thanks
John Dammeyer
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Peter Wallace
Mesa Electronics
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Re: [Emc-users] MESA 7i92H hiccup
> >> > > Your suggesting mechanical? Not some sort of odd glitch that might occur > in > > firmware? > > Yes, either electrical damage to the I/O or perhaps a mechanical > (connector/wiring) issue > > A firmware bug is unlikely since you are not getting a following error > which means the hardware stepgen is getting the right commands and its > position > count is correct. The hardware past the stepgen position count to the > step/dir outputs is pretty trivial so not much room for a bug there. > > > > > So if it happens again I'll put a scope on it. It's also possible the cable > > from the 7i92H has issues and flexing it while cycling the power plug but > > things back. But the cable into the 7i92H hasn't been removed for a while. > > It's always the DB-25 end into the BoB that's used. But again could be > cable. > > > > In either case, is there a software way to reset it? > > Yes, you can use mesaflash to do this: > > mesaflash --device 7i92 --addr xx.xx.xx.xx --reset > Thanks. I'll try that first if it happens again. If it resets but doesn’t fix it we know it's mechanical/electrical. But since pulling out of a pocket and then moving XY (but not actually moving) can break something I think I'll replace the cable anyway. I'll check the input diodes too. Likely not though. I'd think they'd permanently cause problems. I'll report back. John Dammeyer ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] MESA 7i92H hiccup
> > So I guess two questions. > > 1. If it happens again what type of diagnostics can I generate to see what > was happening under the covers. > > 2. Is there a way to clear it without opening up the cabinet and removing 5V > from the 7i92H (I guess a system power cycle would do that too without > opening the cabinet). > > > > Thanks > > John Dammeyer > > > > > > My first guess would be a damaged I/O pin on the 7I92H (so marginal levels) > > > > Peter Wallace > Mesa Electronics > Your suggesting mechanical? Not some sort of odd glitch that might occur in firmware? So if it happens again I'll put a scope on it. It's also possible the cable from the 7i92H has issues and flexing it while cycling the power plug but things back. But the cable into the 7i92H hasn't been removed for a while. It's always the DB-25 end into the BoB that's used. But again could be cable. In either case, is there a software way to reset it? I've got the bits and pieces to make a new cable that is the exact right length so I'll do that later this week. Thanks John Dammeyer ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] MESA 7i92H hiccup
My first guess would be a damaged I/O pin on the 7I92H (so marginal levels)
BTW, a good way to check for I/O pin damage is to check the input protection
diodes with an Ohmmeters diode check function (positive lead to ground, negative
lead to I/O line)
All lines should show a consistent ~0.6V diode forward voltage drop
Most pin damage comes from mismatched ground levels which typically
overcurrent the input protection diodes.
Peter Wallace
Mesa Electronics
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Re: [Emc-users] MESA 7i92H hiccup
On Mon, 27 Jan 2020, John Dammeyer wrote: Date: Mon, 27 Jan 2020 12:27:31 -0800 From: John Dammeyer Reply-To: "Enhanced Machine Controller (EMC)" To: "'Enhanced Machine Controller (EMC)'" Subject: [Emc-users] MESA 7i92H hiccup Hi everyone, Been working on my Spindle Control with the adaptor board to allow either PWM from PP DB25-14 and DB25-16 for Direction. Or for MACH Step on DB25-14 instead of PWM by simply checking a different box. I've had the PP version of LinuxCNC also running the step/dir out but it just can't step fast enough to give me the full 3000 RPM. So today I disconnected the PP port cable. Plugged power and Ethernet cable into the 7i92H and plugged it into the BoB DB-25. Then ran the version of LinuxCNC config that used the 7i92H. Homed. No problem. Spindle spins up/down and reverses with no problem. Ran a small circle cutting G-Code program that lifts the tool about 1" out and then back down for the next level. And suddenly half way through I lost Z motion. Restarting LinuxCNC did nothing. ESTOP OFF/ON did nothing and that removes all power from the motors. The Z axis is a GECKO stepper motor run open loop and no fault signals to the system. Truly move it and expect it to do it. I did first suspect the GECKO but since the ESTOP removes power to it and then recovery puts power back it didn't appear to be the Gecko. The final solution was to stop LinuxCNC, cycle power to the 7i92H by unplugging the external 5V and plugging it back in. Wait a few seconds for Ethernet connectivity and then again run LinuxCNC with the MESA config folder. The BoB power was never removed. Now homing works. Spindle works. Same G-Code made it all the way through. I shouldn't have to cycle power to fix this. Something as simple as an ESTOP should be able to generate a HAL command to the 7i92H driver that causes it to pretend a power cycle occurred. Does this exist? I've never had the Z axis vanish from the PP. I think it's happened before with the 7i92H but I'm not sure. So I guess two questions. 1. If it happens again what type of diagnostics can I generate to see what was happening under the covers. 2. Is there a way to clear it without opening up the cabinet and removing 5V from the 7i92H (I guess a system power cycle would do that too without opening the cabinet). Thanks John Dammeyer My first guess would be a damaged I/O pin on the 7I92H (so marginal levels) Peter Wallace Mesa Electronics ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
