Lenze DDS Function library Drive - Manual (Page 42)

2.3.3 Up/down counter (L_FCNT)
Function library LenzeDrive.lib
Digital signal processing
2−32
L
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 ½count value ½ ³ ½nCmpVal_a ½, 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 ½count value ½ = ½nCmpVal_a ½, 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.