H2: Auxiliary function outputs to PLC
8.2 Predefined auxiliary functions
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
417
Value
The parameters "value" and "type" define the meaning of an auxiliary function, i.e. the system function that is
activated on the basis of this auxiliary function.
The "value" of an auxiliary function is defined in the machine data:
MD22070 $MC_AUXFU_PREDEF_VALUE[<n>] (value of predefined auxiliary functions)
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
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
"Associated auxiliary functions [Page 426]").
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