Believe it or not, I am very familiar with GOOGLE, which is how I stumbled upon this forum to begin with. So instead of only using what I'm learning from the internet through my own research, I figured I could also use the knowledge that others may already possess, which is technically another form of research and the whole point of forums in the first place. Work smarter not harder when you can right? And by the looks of it, it seems like I'm yielding positive results. So thank you for YOUR response, as it was actually very helpful. I'll think of you when I'm handed my diploma.Perhaps for YOUR project, you could use GOOGLE as suggested by your instructor.
Literally 60 seconds of effort turned up a great starting point: The Basics of 4-20mA Current Loop Transmitters.
TI (Texas Instruments) makes a number of current loop transmitters and receivers, so you should be able to find some references there.
From what I understand, most PLCs have analog inputs that only measure voltage. So if i have a transmitter that is outputing 4-20 mA, i need to covert that to a voltage so the PLC can measure it. I have been reading about using shunt/drop resistors in 2/3/4-wire analog inputs to do this conversion. Someone pointed out to me that the FC-33 has this feature. The XTR115 you mentioned seems like it converts a voltage signal to a current signal. What would be the purpose of this since the communication between input devices and the PLC needs to be a voltage? Or am i completely wrong about thatRealistically... You need to look at the XTR115 and XTR116 datasheets, These devices are used a lot with interfacing PLC's I have used them extensively... They are dedicated 4~20mA transmitters..
No, that's not correct. PLCs have numerous input options, and most of the ones that I've worked with could do either one, with the preference towards 4-20mA since that has been the principal industry standard for decades.From what I understand, most PLCs have analog inputs that only measure voltage.
So what would be the specific application of the XTR115 and 116 that you mentioned. The whole concept of the current loop is confusing meNo, that's not correct. PLCs have numerous input options, and most of the ones that I've worked with could do either one, with the preference towards 4-20mA since that has been the principal industry standard for decades.