Output Behavior - Siemens SINUMERIK 840D sl Function Manual
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MD22070 $MC_AUXFU_PREDEF_VALUE[<n>] (value of predefined auxiliary functions)
Note
The "value" cannot be changed for a predefined auxiliary function. For some predefined
auxiliary functions, the "value" can be reconfigured via additional machine data (see Section
"Associated auxiliary functions (Page 408)").
8.2.3.3
Output behavior
Parameter "Output behavior" defines when the predefined auxiliary function is output to the
NC/PLC interface and when it is acknowledged by the PLC.
The setting is done via the following machine data:
MD22080 $MC_AUXFU_PREDEF_SPEC[<n>] (output behavior of predefined auxiliary
functions)
Output behavior relative to motion
Output prior to motion
● The traversing motions (path and/or block-related positioning axis movements) of the
previous part program block end with an exact stop.
● The auxiliary functions are output at the beginning of the current parts program block.
● The traversing motion of the actual part program block (path and/or positioning axis motion)
is only started after acknowledgment of the auxiliary functions by the PLC:
– Output duration one OB1 cycle (normal acknowledgment): after one OB1 cycle
– Output duration one OB40 cycle (quick acknowledgment): after one OB40 cycle
Output during motion
● The auxiliary functions are output at the beginning of the traversing motions (path and/or
positioning axis movements).
● The path velocity of the current parts program block is reduced so that the time to the end
of the block is greater than the time to acknowledgment of the auxiliary functions by the
PLC.
– Output duration one OB1 cycle (normal acknowledgment): one OB1 cycle
– Output duration one OB40 cycle (quick acknowledgment): one OB40 cycle
Output after motion
● The traversing motions (path and/or block-related positioning axis movements) of the
current part program block end with an exact stop.
● The auxiliary functions are output after completion of the traversing motions.
● The block change is performed after acknowledgment of the auxiliary functions by the PLC:
– Output duration one OB1 cycle (normal acknowledgment): after one OB1 cycle
– Output duration one OB40 cycle (quick acknowledgment): after one OB40 cycle
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
H2: Auxiliary function outputs to PLC
8.2 Predefined auxiliary functions
401
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