sundar

Hi to all,
I am using level transmitter(4 to 20mA). some times the transmitter gives lessthan 4mA. i want to show in HMI if the transmitter gives less than 4mA. or I want to set one bit if the transmitter gives less than 4 mA.
PLC: CPU 313C
HMI : MP277

dchartier

...
Simply compare the decimal content of each channel (PIWxxx) with the values in the left column of the attached document.
If the value is between decimals 0 and 27648, you are in the rated range (4-20 mA in your case).
If the value is above 27648 but under 32511, you are in overrange.
If the value is between -1 and -4864, you are underrange.
Above 32512 and under -4865 you are in overflow or underflow ....
...
Daniel Chartier