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2.3.7 Edge evaluation (L_TRANS)

Function library LenzeDrive.lib

Digital signal processing

2−36

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

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

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.

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Lenze DDS Function library Drive Manual do Utilizador Página 46