Allen Bradly analog card ?

XtremeIN

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• Jun 16, 2006

• #1

Hello,
Hopefully this will be quick and easy. Other than the number of inputs is there a difference between the 1746-NI8 and the 1746-NI16I analog cards?
Thanks,
Micheal

 

rgurin

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• Jun 16, 2006

• #2

Yes. The 16-point card you are referring to has isolated inputs.

Rick

 

XtremeIN

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• Jun 16, 2006

• #3

OK, and that means........

 

George Graziano

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• Jun 16, 2006

• #4

On an isolated input card, each input is isolated from each other. Manual usually will tell you what means it used for isolation. On a non-isolated input card, the common is common in groups, usually of 4 or 8 etc.

George

 

rta53

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• Jun 16, 2006

• #5

Another thing is that the 1746-NI16I is current only while the NI8 can be current or voltage.

 

XtremeIN

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• Jun 16, 2006

• #6

Thanks for the help guys.
Micheal

 

Ken Moore

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• Jun 16, 2006

• #7

If the NI16I is configured for Class I, you can only read/write 8 channels per scan, you have to write LL to toggle a bit and get the other 8 channels.

I'm not certain, but I believe if it is used as remote I/O, it must be configured as Class I.

I recommend you download and read the manual, that way you can see the specifications for you self:
http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1746-um001_-en-p.pdf

 

504bloke

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• Jun 16, 2006

• #8

Ken Moore said:

If the NI16I is configured for Class I, you can only read/write 8 channels per scan, you have to write LL to toggle a bit and get the other 8 channels.

Click to expand...

Interesting Ken

I just used one, set to class 3 which was lucky as i had missed the part about class I and toggling a bit to get the other 8 channels working!!