Lenze DDS Global Drive PLC Developer Studio - Manual (Page 36)

Function block library LenzeElectricalShaft.lib
Special functions
2.1.4 Homing function (L_REF)
2−26
L
LenzeElectricalShaft.lib EN 1.2
2.1.4.5 Store the present output value after power interruption
[ V A R _ G L O B A L R E T A I N ] [ V A R _ G L O B A L R E T A I N ]
L _ R E F
d n A c t P o s _ I n _ p
C T R L
b P o s L o a d _ b
b M a r k _ b
b O n _ b
n N I n _ a
d n P o s I n _ p
b R e f O k _ b
b R e f B u s y _ b
n N S e t _ a
b y H o m i n g M o d e
d n R e f O f f s e t
d n H o m i n g S p e e d
w T i T i m e H o m i n g
d n T a r g e t P o s
b A c t T P R e c e i v e d _ b
d n A c t T P L a s t S c a n _ p
T P / M P
C T R L
n N A c t _ v
d n A c t P o s
d n P o s O u t _ p
d n P o w D o w n A c t I n t e R e t a i n
Abb. 2−20 Programming to store the present output value after a supply interruption
In order to store the latest value at dnActPos_p after a supply interruption, you must declare a global
variable of type RETAIN (VAR_GLOBAL RETAIN). Link this variable as shown in Abb. 2−20
·
In this variable, the present value is always stored at dnActPos_p The variable will hold the
value after a supply interruption.
·
When the supply is switched on again, the stored value is read into the FB L_REF from the
variable and applied as the starting value.
Note!
This only applies to Mode 21, no RETAIN−type variable needs to be defined for the other modes.