kanea Posted July 18, 2011 Report Share Posted July 18, 2011 Im having an issue with a M91-2-r2-c Analogue input raw values. I have set jumpers 3 and 4 to B and have configured software for 4-20ma. On 4ma on multimeter I get a raw value in my MI register of 9, and 20ma I get 45. I also changed M91 and software to 0-10v with the same outcome with the raw values. I have been using a signal generator to mimic these values. This is the first time I have used these 91s on Analog and are wondering if I have missed something or the unit is faulty. Thanks for any assistance. Quote Link to comment Share on other sites More sharing options...
Walkerok Posted July 19, 2011 Report Share Posted July 19, 2011 Your jumper settings seem fine and you said you have set the hardware setting On the U90 software for 4-20ma so that all seems correct. Since you are using an external signal simulator to generate the 4-20/0-10VDC analog, if you are using a generator that is generating its own loop power, have you connected the negative side of this simulated signal to the 0V terminal of the U91 and the positive side of your simulator to AN0? If you are using a simulator that does not supply its own loop power then you need to connect the + side of your simulator to the +V terminal of the PLC and the negative side of your simulator to AN0 to get a usable 4-20ma signal into the PLC. Thanks Keith Quote Link to comment Share on other sites More sharing options...
kanea Posted July 31, 2011 Author Report Share Posted July 31, 2011 Thanks for your help. We ordered another one, and you were right on with the signal generator. I was using it incorrectly as I was connecting it the same as the 2 wire transducer but it was self powered. The first unit was faulty as the second unit when installed operated correctly. Thanks Allan Quote Link to comment Share on other sites More sharing options...
Recommended Posts
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.