4-20 ma program

[Pratik Patel]

Hi,

I want to make program for 4-20 ma with AB-Micrologix1000.

I connect my sensor with one monitor, that monitor have output

4-20ma. I want to use this 4-20 ma output for my plc analog input.

so I read my sensor intensity.

I want to set 4ma is 0% intensity and 20 ma is 100% intensity.

I am doing first time plc program. so please bear me.

pratik

 

[Tom Jenkins]

Your message doesn't make the objective of your program or the area of your problem clear. Do you want to know how to convert the 4-20 mA signal to engineering units? Look at the SCL function. Do you want to set an alarm? Look at teh GEQ and LEQ functions. Please provide a little more specific question, and you can get better answers.

 

[Pratik Patel]

Hi,

my monitor measure sensor intensity in %.

so I want my plc measure same reading in sensor monitor.

and I want to set two alarm one at 60% and onther one for 50%.


pratik

 

[Tom Jenkins]

OK - first you use the SCL function to convert the 4-20 mA signal to 0 to 100% engineering units. Store the output of this function in an integer register, such as N10:0. Then you use the GEQ function to compare this register with your limit, and if it is true turn on a bit, such as B11:1/1, to indicate the alarm.

These functions are shown, with examples, in the programming manual. HAve you read them yet?