Re: [Emc-users] Quick question about 7i37
On Fri, 24 Aug 2012, Viesturs L?cis wrote:
> Date: Fri, 24 Aug 2012 18:51:40 +0300
> From: "[UTF-8] Viesturs L?cis"
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users] Quick question about 7i37
>
> 2012/8/24 Peter C. Wallace :
>>> Thank You, got it!
>>> It is the 7i37com that had it much easier to wire up inputs...
>>>
>>> --
>>> Viesturs
>>>
>>> If you can't fix it, you don't own it.
>>> http://www.ifixit.com/Manifesto
>>
>> Yes but if you need a contact to ground input or a sinking output the 7I37COM
>> cannot be used. The 7I737/TA are universal but you pay for this by more
>> wiring
>>
>
> Sinking output also is not available? Thanks for pointing this out. I
> remember that manual mentioned 7i37com not being able to drive AC
> outputs (I actually needed that for the welding robot, so I was happy
> to have "regular" 7i37), but I do not remember it saying something
> else. Probably just lack of attention.
Sinking outputs are not available on the 7I37COM because the outputs have a V+
common so are all "sourcing" or "PNP" type outputs.
If you are making you own machine, this output mode (sourcing) is safer as it
will not enable relays or other loads in case of the most likely type of
"short" failure which is a short to ground. Likewise sinking inputs are safest
in that a short to ground will be interpreted as an inactive input so for
example in a normal NC limit switch situation a short to ground will be
interpreted as an activated limit switch (causing a fault, as it should)
Of course this does not help if you need to be compatible with
existing equipment that needs sinking outputs or sourcing inputs
>
> --
> Viesturs
>
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
> --
> Live Security Virtual Conference
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>
Peter Wallace
Mesa Electronics
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Re: [Emc-users] Quick question about 7i37
2012/8/24 Peter C. Wallace : >> Thank You, got it! >> It is the 7i37com that had it much easier to wire up inputs... >> >> -- >> Viesturs >> >> If you can't fix it, you don't own it. >> http://www.ifixit.com/Manifesto > > Yes but if you need a contact to ground input or a sinking output the 7I37COM > cannot be used. The 7I737/TA are universal but you pay for this by more wiring > Sinking output also is not available? Thanks for pointing this out. I remember that manual mentioned 7i37com not being able to drive AC outputs (I actually needed that for the welding robot, so I was happy to have "regular" 7i37), but I do not remember it saying something else. Probably just lack of attention. -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Quick question about 7i37
> Thank You, got it!
> It is the 7i37com that had it much easier to wire up inputs...
>
> --
> Viesturs
>
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
Yes but if you need a contact to ground input or a sinking output the 7I37COM
cannot be used. The 7I737/TA are universal but you pay for this by more wiring
>
> --
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
Peter Wallace
Mesa Electronics
(\__/)
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(")_(") signature to help him gain world domination.
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threat landscape has changed and how IT managers can respond. Discussions
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threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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Re: [Emc-users] Quick question about 7i37
2012/8/24 Peter C. Wallace : > On Fri, 24 Aug 2012, Viesturs L?cis wrote: > >> Date: Fri, 24 Aug 2012 17:13:22 +0300 >> From: "[UTF-8] Viesturs L?cis" >> Reply-To: "Enhanced Machine Controller (EMC)" >> >> To: "Enhanced Machine Controller (EMC)" >> Subject: [Emc-users] Quick question about 7i37 >> >> Hello! >> >> I looked at 7i37 manual, but did not find it explained: >> How am I supposed to connect input signal from source, whose ground is >> connected to 7i37 power supply ground? Is it sufficient to connect >> only the signal wire, or must I connect also GND? I could not find it >> anywhere, if GND on optoisolators' input side is isolated from power's >> GND or no. > > > You need to connect GND. All 7I37/7I37TA inputs and output are isolated from > PC GND and from each other. > > Note, the 7I37COM is different, it has common + side on outputs and common - > on inputs > > So for a active high input you connect INx- to GND and INx+ to the signal > (that also has GND as its common) > Thank You, got it! It is the 7i37com that had it much easier to wire up inputs... -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Quick question about 7i37
On 08/24/2012 07:13 AM, Viesturs Lācis wrote: > Hello! > > I looked at 7i37 manual, but did not find it explained: > How am I supposed to connect input signal from source, whose ground is > connected to 7i37 power supply ground? Is it sufficient to connect > only the signal wire, or must I connect also GND? I could not find it > anywhere, if GND on optoisolators' input side is isolated from power's > GND or no. I believe the inputs of the 7i37 are isolated from everything, including power and ground. Since the signal source is already connected to the same ground as the 7i37 power supply you could connect the signal source to the (+) pin of the 7i37 input, and connect the (-) pin of the 7i37 input to power GND. This assumes your signal source is capable of driving the input to the minimum 4-volt signal level required by the 7i37 input. Some outputs do a better job driving to ground than they do a positive voltage. In this case, you could connect the (+) pin of the 7i37 input to +5V, and the (-) pin of the 7i37 input to the signal source. You will have to use the right hal output since the polarity will be inverted. Karl -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Quick question about 7i37
On Fri, 24 Aug 2012, Viesturs L?cis wrote:
> Date: Fri, 24 Aug 2012 17:13:22 +0300
> From: "[UTF-8] Viesturs L?cis"
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: [Emc-users] Quick question about 7i37
>
> Hello!
>
> I looked at 7i37 manual, but did not find it explained:
> How am I supposed to connect input signal from source, whose ground is
> connected to 7i37 power supply ground? Is it sufficient to connect
> only the signal wire, or must I connect also GND? I could not find it
> anywhere, if GND on optoisolators' input side is isolated from power's
> GND or no.
You need to connect GND. All 7I37/7I37TA inputs and output are isolated from
PC GND and from each other.
Note, the 7I37COM is different, it has common + side on outputs and common -
on inputs
So for a active high input you connect INx- to GND and INx+ to the signal
(that also has GND as its common)
>
> --
> Viesturs
>
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
> --
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
Peter Wallace
Mesa Electronics
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Re: [Emc-users] Quick question about 7i37
On Fri, Aug 24, 2012 at 10:13 AM, Viesturs Lācis wrote: > Hello! > > I looked at 7i37 manual, but did not find it explained: > How am I supposed to connect input signal from source, whose ground is > connected to 7i37 power supply ground? Is it sufficient to connect > only the signal wire, or must I connect also GND? I could not find it > anywhere, if GND on optoisolators' input side is isolated from power's > GND or no. > I assume you mean the opto isolated inputs. In which case (from memory, trust but verify) you need to set up a voltage across the two input pins associated with each input. You wouldn't want to go to ground on the 7i37 side because that messes up the isolation. You probably will want to use your own ground on the equipment side as the low voltage. Eric -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
