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example 4-20mA represent 900-1000unit (after doing scaling). i have a set point at 950. if reading below 950(using Compare instruction), i
give alarm output bit=1. However, if it fall below 3.5mA or above 21mA, i am suprise i get reading above 1000. hence alarm bit=0.
i have put in extra compare instruction to compare if reading above 1000, move #0 into the reading register. hence when this condition is
TRUE, #0 is move into reading. But once #0 move into reading, the condition become FALSE. and hence the condition will toggle.
am i doing it wrongly?? any advice??
give alarm output bit=1. However, if it fall below 3.5mA or above 21mA, i am suprise i get reading above 1000. hence alarm bit=0.
i have put in extra compare instruction to compare if reading above 1000, move #0 into the reading register. hence when this condition is
TRUE, #0 is move into reading. But once #0 move into reading, the condition become FALSE. and hence the condition will toggle.
am i doing it wrongly?? any advice??