paranthaman

hi guys.. am using cpu 313c 24 di / 16do, 5AI / 2AO.... in this 2AO i set current 4- 20mA, when my output value is minimum (r) Zero i want 4 mA and maximum (r) 100 i want 20 mA . now my output is showing 0 that time i GET & mA. WHY this my module given wrong value. please help me am in urgent

STEP7 Online Manual

Unscaling Values: FC106
Description

The UNSCALE function takes a real input value (IN) in engineering units scaled between a low and a high limit (LO_LIM and HI_LIM) and converts it to an integer value. The result is written to OUT. The UNSCALE function uses the equation:

OUT = [ ((IN–LO_LIM)/(HI_LIM–LO_LIM)) * (K2–K1) ] + K1

and sets the constants K1 and K2 based upon whether the input value is BIPOLAR or UNIPOLAR.

· BIPOLAR: The output integer value is assumed to be between –27648 and 27648, therefore, K1 = –27648.0 and K2 = +27648.0

· UNIPOLAR: The output integer value is assumed to be between 0 and 27648, therefore, K1 = 0.0 and K2 = +27648.0

If the input value is outside the LO_LIM and HI_LIM range, the output (OUT) is clamped to the nearer of either the low limit or the high limit of the specified range for its type (BIPOLAR or UNIPOLAR) and an error is returned.

paranthaman

here no problem in scaling, following are my scaling function, CALL "Scal_In" FC 6 Value_In :="DB_SSK_Sprinkler".SP_CalSpeed_SSK14 DB9.DBD128 LO_Limit_In :=0.000000e+000 HI_Limit_In :=1.000000e+002 LO_Limit_Out:=0.000000e+000 HI_Limit_Out:=2.764800e+004 Value_Out :=#ValueOut Overrange_LO:=L8.0 Overrange_HI:=L8.1 L #ValueOut TRUNC T "f_Screw_Feeder_VFD_1_2" PQW 310