Jump to content
Sign in to follow this  

Recommended Posts

Hi,

 

I'm using a V200-18-E1B and I have an analog input from a 4-20 mA amp gage. The problem I have is the reading I get is always a negative number. Instead of seeing 22 it's -22. I have it set up in linerization where x is 204-1023 and y is 0-100 representing a %. I have a common 0V going to 0V on the analog input. I jumpered V and I together and connected one side of the amp gage to that and the other to the 0V. Am I doing something wrong? I keep looking over the specs and how I configured and I'm drawing a blank.

 

Justin

Share this post


Link to post
Share on other sites

If the input value is always 0, this indicates that you are not receiving an analog signal from the 4-20 sensor. I would double check both the wiring and that the snap in module is properly receiving 24V power. It does not receive power from the attached PLC and must have either an separate power supply, or jumpered power from the PLC.

Share this post


Link to post
Share on other sites

All my other inputs and outputs on the snap in module are fine. The power supply isn't the issue. On the analog inputs there is the following for each of the 3:

 

V

I

0V

 

The 4-20 mA sensor clamps around a motor lead and has a "+" and a "-" connection. I think I may have figured out my problem, will have to check next time I'm at work. What I did was go from the + of sensor and go to V and I of ANI0 and the - to 0V. But I don't have any 24VDC + going to it. I'm thinking I need to have the 24VDC + to + of sensor and then the - to I and V and 0V going with the other commons. Now that I think of it, I forgot to give it power. It's usually always something simple, lol.

Share this post


Link to post
Share on other sites

Hi Justin

 

You dont use the V on the controller when you have a current input, it is used only for voltage input.

You need a 24v supply where the - of the supply is connected to the 0 on the unitronics.

The + of the supply is connected to the + of your 4-20ma transmitter.

The - of your transmitter is connected to "I" on the unitronics.

V is left with no connection.

 

Regards

 

Denis

Share this post


Link to post
Share on other sites

Justin,

 

I believe you may have found the solution. For further reference you can also find the wiring for 2,3, and 4 wire sensors for the V200-18-E1B and all of our other I/O modules and PLC's within our technical library on our support page:

 

http://www.unitronics.com/support/technical-library

 

The Snap-In Module specificaitons can be found within the Vision Hardware section.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...