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by auto_man
Wed Aug 09, 2017 2:07 am
Forum: SIMATIC system
Topic: The calculation results show "NaN",pls help me
Replies: 3
Views: 1851

The calculation results show "NaN",pls help me

I have a project used PCS7V8.2 & IL & 315-2DP, and I create a FB like "Lag" in APL. The SCL program is shown as follows: OUT := SEL(G:=LAG_T<=0.0,IN0:=IN + (sr_lv_out-IN)*(EXP(-Sample_T/LAG_T)),IN1:=IN); sr_lv_out := OUT; If the input ("IN") is fixed in a negative number always , and a few hours lat...