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9. Exclusive Commands
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9.6.5 Parameters (DDB function instructions from PLC)
Parameters for chopping functions (DDB function instructions from PLC) are as follows.
<Compensation value sequential update method>
• Rapid traverse override valid/invalid selection
• Chopping axis
• Upper dead center point position L1 (increment from the basic position)
• Bottom dead center point position L2 (increment from the upper dead center point)
• Number of cycles/min
<Compensation value fixed method>
• Mode for the compensation value fixed method
• Data No.
Each parameter can be set from PLC using DDB function.
The master parameter is kept in R register, and when changing parameters, it is read into the current
parameter area in the NC by the DDB function instruction.
Parameters can be changed during chopping.
(1) Program example
Set the control data with MOV instruction, etc.
ACT
S.DDBA Rn
(Note) Writing parameters from PLC using DDB at every scan execution may cause a longer
cycle time because the chopping axis stops once at the bottom dead center point and the
upper dead center point even if the value is not to be changed. Thus, change the
parameter (turn "ACT" ON) only when necessity of parameter change arose.)