Lenze DDS Function library Drive - Manual (Page 46)

2.3.7 Edge evaluation (L_TRANS)
Function library LenzeDrive.lib
Digital signal processing
2−36
L
LenzeDrive.lib EN 1.7
2.3.7 Edge evaluation (L_TRANS)
This FB is a post−triggered edge detector. You can use this function to detect digital signal transitions
(edges) and turn them into defined pulses.
L_TRANS
bIn_b
0 t
byFunction
bOut_b
wPulseTime
Fig. 2−45 Edge evaluation (L_TRANS)
VariableName DataType SignalType VariableType Note
bIn_b Bool binary VAR_INPUT
bOut_b Bool binary VAR_OUTPUT (retriggerable)
byFunction Byte − VAR CONSTANT RETAIN Selection of the function
wPulseTime Word − VAR CONSTANT RETAIN Pulse duration of the output signal
Parameter codes of the instances
VariableName L_TRANS1 L_TRANS2 L_TRANS3 SettingRange Lenze
byFunction C0710 C0715 C1140 0 ... 2 0
wPulseTime C0711 C0716 C1141 0.001 ... 60.000 s 0.001
VariableName L_TRANS4 SettingRange Lenze
byFunction C1145 0 ... 2 0
wPulseTime C1146 0.001 ... 60.000 s 0.001
Range of functions
·
Evaluate rising edges
·
Evaluate falling edges
·
Evaluate rising and falling edges
2.3.7.1 Evaluate rising edges
byFunction = 0
t
t
bIn_b
bOut_b
wPulseTime wPulseTime
Fig. 2−46 Evaluation of FALSE−TRUE transitions
Functional sequence
1. If a TRUE−FALSE or a FALS−TRUE transition occurs at nIn_b, then bOut_b switches = TRUE.
2. After the time defined as wPulseTime has elapsed, then bOut_b switches = FALSE, provided
no further FALSE−TRUE transition has occurred at nIn_b.