Hey guys,
I'm reading in analog values from 1794-IE8 flex IO card to my PLC-5/40 using BTR instructions. Now, I'm doing my scaling in wonderware InTouch 7.1. I believe 4ma=0 and 20ma= 30840. Please confirm that.
Also, when you do the BTW instruction what configuration you write to those cards in the first PLC scan. Only thing I found in the manual was to punch in a decimal value of -256 as the first word of the data file in your BTW instruction (and length=1) showing a configuration of 4-20mA. Is that right or I have to do anything else ? Is there way to get a scaled analog value directly from the cards by configuring the BTW instruction in a certain way ?
Any help is appreciated.
Thank you.
I'm reading in analog values from 1794-IE8 flex IO card to my PLC-5/40 using BTR instructions. Now, I'm doing my scaling in wonderware InTouch 7.1. I believe 4ma=0 and 20ma= 30840. Please confirm that.
Also, when you do the BTW instruction what configuration you write to those cards in the first PLC scan. Only thing I found in the manual was to punch in a decimal value of -256 as the first word of the data file in your BTW instruction (and length=1) showing a configuration of 4-20mA. Is that right or I have to do anything else ? Is there way to get a scaled analog value directly from the cards by configuring the BTW instruction in a certain way ?
Any help is appreciated.
Thank you.