Communication Error Message
- Holzwurm56
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12 Jan 2017 21:27 #85673
by Holzwurm56
Communication Error Message was created by Holzwurm56
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12 Jan 2017 21:56 - 12 Jan 2017 21:57 #85675
by PCW
Replied by PCW on topic Communication Error Message
Have you run a latency test on you PC?
If you have bad latency issues you may have a watch dog bite
which will stop all serial comms (and generate a slew of error messages)
You can check this by looking at the watchdog_has_bit pin after you get
these error messages. if its set (true) you have a latency issiue
Its also possible that you have a 5V power issue at the 7I77
This can also typically cause this kind of loss of communication
Normally 7I77 5V power should not come from the FPGA card
as there will be too much current once enough encoders are connected
This means:
5I25 W2 DOWN
7I77 W5 RIGHT
External 5V power source to 7I77 TB1
If you have bad latency issues you may have a watch dog bite
which will stop all serial comms (and generate a slew of error messages)
You can check this by looking at the watchdog_has_bit pin after you get
these error messages. if its set (true) you have a latency issiue
Its also possible that you have a 5V power issue at the 7I77
This can also typically cause this kind of loss of communication
Normally 7I77 5V power should not come from the FPGA card
as there will be too much current once enough encoders are connected
This means:
5I25 W2 DOWN
7I77 W5 RIGHT
External 5V power source to 7I77 TB1
Last edit: 12 Jan 2017 21:57 by PCW.
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13 Jan 2017 11:32 #85686
by Holzwurm56
Replied by Holzwurm56 on topic Communication Error Message
Hello,
I have an external power supply. What units get voltage from this connector? The powersupply can give 2Amp.
Thanks
Hans
I have an external power supply. What units get voltage from this connector? The powersupply can give 2Amp.
Thanks
Hans
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13 Jan 2017 13:49 #85691
by bevins
Typically you use two seperate power supplies.
5vdc used for encoders and I dont know if anything else on the board uses it
Field voltage power, which is used for logic on the board and/or I/O, this is typically 12 to 24VDC
You can go a step further and split you field votage power so power from the logic board is seperated from the power going out into the field.
Replied by bevins on topic Communication Error Message
Hello,
I have an external power supply. What units get voltage from this connector? The powersupply can give 2Amp.
Thanks
Hans
Typically you use two seperate power supplies.
5vdc used for encoders and I dont know if anything else on the board uses it
Field voltage power, which is used for logic on the board and/or I/O, this is typically 12 to 24VDC
You can go a step further and split you field votage power so power from the logic board is seperated from the power going out into the field.
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13 Jan 2017 14:45 #85692
by PCW
Replied by PCW on topic Communication Error Message
Is it possible you have a loose connection?
Those errors look like you totally lost connection to the 7I77
What LinuxCNC version are you running?
If this happens again can you post your dmesg log here?
(so all errors can be seen )
Those errors look like you totally lost connection to the 7I77
What LinuxCNC version are you running?
If this happens again can you post your dmesg log here?
(so all errors can be seen )
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- Holzwurm56
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13 Jan 2017 15:22 #85694
by Holzwurm56
Replied by Holzwurm56 on topic Communication Error Message
Hello,
I use two separate power supplies one with 5V and one with 24V.
I use Wheezy with LinuxCNC 2.7.
Thanks
Hans
I use two separate power supplies one with 5V and one with 24V.
I use Wheezy with LinuxCNC 2.7.
Thanks
Hans
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13 Jan 2017 15:42 #85696
by PCW
Replied by PCW on topic Communication Error Message
That really does suggest that there's a loose connection or power supply issue
Things to check:
5V at 7I77 is OK (measure when jogging)
5I25 and 7I77 power options are right (5I25 W2 DOWN 7I77 W5 RIGHT)
Cable from 5I25 to 7I77 is secure and IEEE1284 compliant
No bad latency issues (run servo thread only latency test for an hour or so while "torturing" PC)
Post dmesg results here after you get the error (so all errors are available for analysis)
Things to check:
5V at 7I77 is OK (measure when jogging)
5I25 and 7I77 power options are right (5I25 W2 DOWN 7I77 W5 RIGHT)
Cable from 5I25 to 7I77 is secure and IEEE1284 compliant
No bad latency issues (run servo thread only latency test for an hour or so while "torturing" PC)
Post dmesg results here after you get the error (so all errors are available for analysis)
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