Simulating PLC load w/Loop Powered Device
Simulating PLC load w/Loop Powered Device
(OP)
I have a 4-20mA transmitter that I need to power up just for using the display on the unit, there's no PLC in the application. I thought 250ohms was the minimum resistance i'd have to wire between the 24VDC supply and the transmitter to simulate the load of the PLC, but wanted to confirm if my thinking is right.
With a 24VDC supply, and a transmitter that requires at least 11VDC, would anything between 250 and 650ohms be usable? (13VDC max Vdrop/20mA=650ohms)and (5VDC min Vdrop/20mA=250ohms)
Thanks in advance
With a 24VDC supply, and a transmitter that requires at least 11VDC, would anything between 250 and 650ohms be usable? (13VDC max Vdrop/20mA=650ohms)and (5VDC min Vdrop/20mA=250ohms)
Thanks in advance





RE: Simulating PLC load w/Loop Powered Device
TTFN

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RE: Simulating PLC load w/Loop Powered Device
RE: Simulating PLC load w/Loop Powered Device
RE: Simulating PLC load w/Loop Powered Device
xnuke
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RE: Simulating PLC load w/Loop Powered Device
If you need to talk HART to configure the transmitter, then you'll need a minimum of 230 ohms in the loop, but 250 ohms is frequently used because that value is common in instrument shops, 270 or 330 ohms when you have to go to Radio Shack.