Lenze DDS Function library Drive Uživatelský manuál stáhnout pdf (Strana 43)

Function library LenzeDrive.lib

Digital signal processing

2.3.4 Flip−flop (L_FLIP)

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LenzeDrive.lib EN 1.7

2.3.4 Flip−flop (L_FLIP)

This FB is implemented as a D flip−flop. You can use this function to evaluate and store digital signal

transitions (edges).

bD_b

bClk_b

bClr_b

bOut_b

L_FLIP

CLR

Fig. 2−39 Flipflop (L_FLIP)

VariableName DataType SignalType VariableType Note

bD_b Bool binary VAR_INPUT

bClk_b Bool binary VAR_INPUT Evaluates FALSE−TRUE edges only

(edge−triggered).

bClr_b Bool binary VAR_INPUT Evaluates the input level only; input has highest

priority (reset input).

bOut_b Bool binary VAR_OUTPUT

Functional sequence

bD_b

bClk_b

bOut_b

Fig. 2−40 Sequence of a flip−flop

bClr_b always has priority.

1. If bClr_b = TRUE, then bOut_b switches = FALSE. This state is held as long as bClr_b = TRUE.

2. A FALSE−TRUE edge at bClk_b switches bD_b = bOut_b. This state is stored until

– another FALSE−TRUE edge occurs at bClk_b or

– bClr_b switches = TRUE.

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Lenze DDS Function library Drive Uživatelský manuál Strana 43