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  • MVP 2023

I enlarged the snapin image and it's hard to tell, but make sure the 0V & V1 connections are in the end of the connector, not 1 location inwards.  The alignment in the photo shows 5N1 and BP1 into 0V & V2 looking correct, but the same lines into 0V & V1 look the same visual alignment but this means that they are one terminal upwards.  If you could redo pics of the an input and an outputs from the side which will show the exact cable insertions that might help checking.  I'm assuming 5N1 is 0V.

It also appears that you're running them from separate supplies.  This can cause issues.

On Gabriel's suggestion, there are many references on the forum to snap-in tricks and fixes.  The main one being that they have little room for error in mounting, and need to be fully in and retained that way.  Some people add screws where you can, I use gaffer tape.

cheers, Aus

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2 hours ago, Ausman said:

I enlarged the snapin image and it's hard to tell, but make sure the 0V & V1 connections are in the end of the connector, not 1 location inwards.  The alignment in the photo shows 5N1 and BP1 into 0V & V2 looking correct, but the same lines into 0V & V1 look the same visual alignment but this means that they are one terminal upwards.  If you could redo pics of the an input and an outputs from the side which will show the exact cable insertions that might help checking.  I'm assuming 5N1 is 0V.

It also appears that you're running them from separate supplies.  This can cause issues.

On Gabriel's suggestion, there are many references on the forum to snap-in tricks and fixes.  The main one being that they have little room for error in mounting, and need to be fully in and retained that way.  Some people add screws where you can, I use gaffer tape.

cheers, Aus

Looks offset to me also.... perhaps a simple wiring error....

I'm one of those people who have added screws to hold the snap-I/O in place, Unitronics added screw bosses to the PLC's years back, but the never did include screw holes in the snap-I/O modules. I made up a drill template to accurately place four holes in the corners of the snap-I/O modules, which resolved loose module issues in our high vibration machines.

JohnR

 

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Hello everyone,

Thanks for the help. The problem was not the io module.  When snap in we notice the pins were not fully inserted and it was loose. I removed the back cover of the HMI and placed the io module fully inserted and now the io module is communicating with the plc. Wish I found this problem earlier.

 

thumbnail_IMG_7028.jpg

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Again, a good reason to properly secure the Snap I/O to the PLC, as I've mentioned many times in the past.

Unitronics provided screw bosses on the PLC's a few years back, but never provided screw holes in the Snap I/O modules...

Do yourself a favor and make the needed holes to screw it down, or use gaffers tape , or zip ties..

something to hold the module firmly in place...

image.png.c59cf5f99257379e257d984c0dd401c8.png

Note the totally unintentional reference to Joe T in the picture...😉

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