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I would say it is possible, but the snap on module will be awkward to din-rail mount.  I would also be concerned about noise pickup with the flat cable.  You could use the expansion modules instead. 

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On forum is present topic  about  self made ribbon cable used for connection of expansion modules in two rows.

If in your application used only standard  input and output (no HSI or HSO or analog I/O) maybe this type of connection is possible.

But it is not recommended in application with VFD or another EMI sorces.

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I haven't tried it with a Snap module, but I have had success un-officially extending the 10 pin bus on the regular I/O modules.

Heed kratmel's warning - that's a 5V TTL signal on that cable and you may open yourself up to noise issues.

Joe T.

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I've also successfully extended the expansion cable with a standard Cat 5 Ethernet cable. Note: extended, not replaced, as the pinout is different between the expansion cable and an Ethernet cable - you have to use an Ethernet coupler and a straight-thru Ethernet cable and make sure the direction is correct per the labeling on the expansion cable.

And as Joe suggests, these modifications are problematic in high noise environments.

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1 hour ago, Flex727 said:

And as Joe suggests, these modifications are problematic in high noise environments.

And needless to say, are not approved by Unitronics, to the best of my knowledge.

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2 hours ago, Flex727 said:

not approved by Unitronics

No, not at all.  In fact, Unitronics will firmly tell you not to do it.

This reminds me of another thread on the forum where people are complaining because their SD card extension cable is causing issues.

If you're hacking something with non-official parts, you are on your own.  Not that I'm discouraging hacking.

Joe T.

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