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2.3.3 Up/down counter (L_FCNT)

Function library LenzeDrive.lib

Digital signal processing

2−32

LenzeDrive.lib EN 1.7

2.3.3 Up/down counter (L_FCNT)

This FB is a digital up/down counter, that is limited to the value nCmpVal_a.

CTRL

L_FCNT

bClkUp_b

nLdVal_a

bLoad_b

nCmpVal_a

byFunction

bClkDown_b

nOut_a

bEqual_b

Fig. 2−38 Up/down counter (L_FCNT)

VariableName DataType SignalType VariableType Note

bClkUp_b Bool binary VAR_INPUT FALSE−TRUE edge = counts up by 1.

bClkDwn_b Bool binary VAR_INPUT FALSE−TRUE edge = counts down by 1.

nLdVal_a Integer analog VAR_INPUT Start value

bLoad_b Bool binary VAR_INPUT  TRUE = accept start value

 The input has the highest priority.

nCmpVal_a Integer analog VAR_INPUT Comparison value

nOut_a Integer analog VAR_OUTPUT The count value is limited to ±32767.

bEqual_b Bool binary VAR_OUTPUT TRUE = comparison value reached.

byFunction Byte VAR CONSTANT RETAIN Selection of the function

Parameter codes of the instances

VariableName L_FCNT1 SettingRange Lenze

byFunction C1100 1 ... 2 1

Function

Selection of the

Function

Description

byFunction = 1  If the count value   nCmpVal_a , the output bEqual_b is set to TRUE. At the next clock cyle, the

counter is reset to the value nLdVal_a and the output bEqual_b is set to FALSE.

byFunction = 2  If the count value  = nCmpVal_a , the counter stops( bClkUp_b / bClkDwn_b are ignored).

 bLoad_b = TRUE sets the counter to the value at nLdVal_a and responds to bClkUp_b / bClkDwn_b

again.

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Lenze DDS Function library Drive Bedienungsanleitung Seite 42