Siemens SINUMERIK 840Di Function Manual page 479

2.1.4 Parameter: Output behavior
Function
The "output behavior" defines when the auxiliary function is output to the NC/PLC interface
and when it is acknowledged by the PLC:
MD22080 $MC_AUXFU_PREDEF_SPEC[ index ] (specification of output behavior)
Bit Value
0
1
2
3
4
5
6
7
8
Bit0: Output duration one OB1 cycle (normal acknowledgment)
An auxiliary function with normal acknowledgment is output to the NC/PLC interface at the
beginning of the OB1 cycle. Auxiliary-function-specific change signals indicate to the PLC
user program that the auxiliary function is valid.
The auxiliary function is acknowledged as soon as organization block OB1 has run once.
This corresponds to a complete PLC user cycle.
The auxiliary function with normal acknowledgment is output in synchronism with the part
program block in which it is programmed. If execution of the part program block, e.g. path
and/or positioning axis movements, is completed before acknowledgment of the auxiliary
function, the block change is delayed until after acknowledgment by the PLC.
In continuous-path mode, a constant path velocity can be maintained in conjunction with an
auxiliary function with normal acknowledgment, if the auxiliary function is output by the PLC
during the traverse movement and before reaching the end of block.
Auxiliary Function Output to PLC (H2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Meaning
1 Output duration one OB1 cycle (normal acknowledgment)
1 Output duration one OB40 cycle (quick acknowledgment)
1 No predefined auxiliary function
1 No output (can only be set as a single bit)
1 Spindle response following acknowledgment
1 Output prior to motion
1 Output during motion
1 Output at block end
1 The collected auxiliary function is not output after a block search.
Detailed Description
2.1 Predefined auxiliary functions
2-5