Any experiencies with 7i76E
16 Jun 2014 14:25 #48000
by uli12us
Any experiencies with 7i76E was created by uli12us
I have seen, mesa have a new Board 7i76E, which is the same like a combination of a 7I76 daughterboard and the 7i80 Lan FPGA Card.
I need for my Project this card and a 7i77 for controlling a 5 axis machine, i wonder if it runs correctly,
because the step/dir output of the card is only a asynchronous axe (toolchanger turret chain). Because the distance from the computer to the FPGA is more than 4metres through a not really big tube, I want use a lan cable instead of the 25wire parallel cabel. So the new card will be better than the method with either 5i25 or 7i80 because it needs a bit less harness.
I need for my Project this card and a 7i77 for controlling a 5 axis machine, i wonder if it runs correctly,
because the step/dir output of the card is only a asynchronous axe (toolchanger turret chain). Because the distance from the computer to the FPGA is more than 4metres through a not really big tube, I want use a lan cable instead of the 25wire parallel cabel. So the new card will be better than the method with either 5i25 or 7i80 because it needs a bit less harness.
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17 Jun 2014 09:38 #48021
by PCW
Replied by PCW on topic Any experiencies with 7i76E
The 7I76e is supported by the experimental ubc-7i80 branch and Preemt-RT.
Preemt-RT works well enough with a decent MB to get a reliable 2 KHz servo thread
I'm currently testing with the Gigabyte J1800-D2H (which is quite nice since its fast and fanless),
Ubuntu 12.04 and preemt-rt 3.14 kernel .
The equivalent Asrock CPU should be the same but doesn't not have the BIOS issues the Gigabyte
has with linux (needs a BIOS upgrade to boot)
Preemt-RT works well enough with a decent MB to get a reliable 2 KHz servo thread
I'm currently testing with the Gigabyte J1800-D2H (which is quite nice since its fast and fanless),
Ubuntu 12.04 and preemt-rt 3.14 kernel .
The equivalent Asrock CPU should be the same but doesn't not have the BIOS issues the Gigabyte
has with linux (needs a BIOS upgrade to boot)
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18 Jun 2014 19:07 #48063
by andypugh
Don't ignore the possibility of using software stepgen on GPIO for things like a toolchanger. Your step rate will only be 1kHz (max 300rpm on the stepper) but it will work and might save on hardware.
Replied by andypugh on topic Any experiencies with 7i76E
I need for my Project this card and a 7i77 for controlling a 5 axis machine, i wonder if it runs correctly,
because the step/dir output of the card is only a asynchronous axe (toolchanger turret chain).
Don't ignore the possibility of using software stepgen on GPIO for things like a toolchanger. Your step rate will only be 1kHz (max 300rpm on the stepper) but it will work and might save on hardware.
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19 Jun 2014 03:43 - 19 Jun 2014 03:51 #48088
by uli12us
Replied by uli12us on topic Any experiencies with 7i76E
That with the 1kHz will not be a problem. I have a servo motor with +/- 10V for the toolchain, but because the axe don't need to be synchronous to any other I will change the servo amp for a Gecko 520 iirc. The machine have a doublegrip changer, so I can search the correct tool while the machine is running, therefore a slow speed isn't an issue. With this combination I can build an separate horizontal dividing head, with this I can use long raw material in the machine. At the moment I can take only very short parts because the dividing table is vertically orientated. I think, its easier to find a step/dir driver for a stepper motor, than to search a cheap +/-10V drive with a servomotor.
I fear, thats a potential problem with the processing, because the 7i77 is the important board, but is the second in the chain.
If that its not the problem, I think its a better combination than the 7i80 with a 7i76 and 7i77. 1 Board less, some 100$ cheaper and a little less harness, not really much, only 1 cable from 26 doublerow to D-Sub.
Or is it much better, if I use a 5 or 6i25 Board in the MB. With this I have the problem to solder the 25pin connector. because I must pull the cable through a I think 2" tube, that isn't empty
I fear, thats a potential problem with the processing, because the 7i77 is the important board, but is the second in the chain.
If that its not the problem, I think its a better combination than the 7i80 with a 7i76 and 7i77. 1 Board less, some 100$ cheaper and a little less harness, not really much, only 1 cable from 26 doublerow to D-Sub.
Or is it much better, if I use a 5 or 6i25 Board in the MB. With this I have the problem to solder the 25pin connector. because I must pull the cable through a I think 2" tube, that isn't empty
Last edit: 19 Jun 2014 03:51 by uli12us.
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19 Jun 2014 04:12 #48089
by PCW
Replied by PCW on topic Any experiencies with 7i76E
If you only have a single stepper and the 7I77 has enough general purpose I/O, a 7I76 is massive overkill
so maybe a 7I80DB+7I77 plus a low cost parallel port breakout for the 7I80DB--> step/dir interface
so maybe a 7I80DB+7I77 plus a low cost parallel port breakout for the 7I80DB--> step/dir interface
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19 Jun 2014 05:17 #48091
by andypugh
There are step/dir servo drives that might work for you. (Gecko do one, in fact).
Alternatively, Mesa do some digitally-controlled servo drives which are pretty well priced (because they are dumb and offload everything to LinuxCNC)
What type of servo motor is it, and what power rating?
Replied by andypugh on topic Any experiencies with 7i76E
I think, its easier to find a step/dir driver for a stepper motor, than to search a cheap +/-10V drive with a servomotor.
There are step/dir servo drives that might work for you. (Gecko do one, in fact).
Alternatively, Mesa do some digitally-controlled servo drives which are pretty well priced (because they are dumb and offload everything to LinuxCNC)
What type of servo motor is it, and what power rating?
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19 Jun 2014 15:55 - 19 Jun 2014 16:42 #48113
by uli12us
Replied by uli12us on topic Any experiencies with 7i76E
PCW; Additional to the one or two step/dir channels I need the complete I/O channels from both boards. In the machine I have two complete Input boards and 1 output board with each 32 channels. And 1 board with only 2 or 3 Inputs, that I can substitute or remove. Mainrotation recognition or similiar.
Andypugh; I want to change the working +/-10V servoamp for a Gecko 520X iirc because a second 7i77 will be 60$ more than a 7i76. And the later added step/dir Driver will be as well cheaper than a +/-10V drive
A 7i76E is 70$ cheaper than a 7i80 and a 7i76
The Servo motor is an axem MC13S 375W DC 64V 7,6A 3000rpm
Andypugh; I want to change the working +/-10V servoamp for a Gecko 520X iirc because a second 7i77 will be 60$ more than a 7i76. And the later added step/dir Driver will be as well cheaper than a +/-10V drive
A 7i76E is 70$ cheaper than a 7i80 and a 7i76
The Servo motor is an axem MC13S 375W DC 64V 7,6A 3000rpm
Last edit: 19 Jun 2014 16:42 by uli12us.
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19 Jun 2014 17:07 #48114
by andypugh
Or, possibly the 7i83 to control an analogue servo: store.mesanet.com/index.php?route=produc...83_88&product_id=122
Replied by andypugh on topic Any experiencies with 7i76E
Note that the 7i77 has a Smart-Serial port on board to which you can connect (for example) a 7i70 store.mesanet.com/index.php?route=produc...83_88&product_id=111PCW; Additional to the one or two step/dir channels I need the complete I/O channels from both boards. In the machine I have two complete Input boards and 1 output board with each 32 channels. And 1 board with only 2 or 3 Inputs, that I can substitute or remove. Mainrotation recognition or similiar.
Or, possibly the 7i83 to control an analogue servo: store.mesanet.com/index.php?route=produc...83_88&product_id=122
There is store.mesanet.com/index.php?route=produc...83_90&product_id=147 but that would need to connect to one of the 50-pin boards (either a PCI card like the 5i23, a parallel-port card like the 7i90 or possibly the 7i80 (Ethernet connection, but I am not sure how well supported that is)The Servo motor is an axem MC13S 375W DC 64V 7,6A 3000rpm
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19 Jun 2014 18:51 #48121
by uli12us
Replied by uli12us on topic Any experiencies with 7i76E
As I say, I need 2 step/dir or analog outputs for toolchain and later a dividing head. The machine itself needs 6 analog channels for x, y, z, b, c and spindle. additionally I need at least 64 DI and 32 DO. All of that I can make with either a 5/6i25, 7i76 and 7i77.
If I change the 5/6i25 for a 7i80 then I have only one small easy placeable cable in my machine and can use any computer I want. Not only a board with PCI(e) connectors. If I change the 7i80 with the 7i76 then I have the same but for a price 10/30$ lower then the combination with 5/6i25.
I know that I can change the 7i76 with the 7i84 but the extra 2axes step/dir will probably cost more, than the saving and I need more harnessing.
I want to change the control from my machine in the simplest, way with as few as possible parts.
Thats primarly, because I think its necessary, that I have from each part a spare part in stock.
If I change the 5/6i25 for a 7i80 then I have only one small easy placeable cable in my machine and can use any computer I want. Not only a board with PCI(e) connectors. If I change the 7i80 with the 7i76 then I have the same but for a price 10/30$ lower then the combination with 5/6i25.
I know that I can change the 7i76 with the 7i84 but the extra 2axes step/dir will probably cost more, than the saving and I need more harnessing.
I want to change the control from my machine in the simplest, way with as few as possible parts.
Thats primarly, because I think its necessary, that I have from each part a spare part in stock.
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