Output Behavior - Siemens SINUMERIK 840D sl Function Manual

8.16.2

Output behavior

Thread cutting
During active thread cutting G33, G34 and G35, the following output behavior is always active
for the spindle-specific auxiliary functions:
● M3 (spindle right)
● M4 (spindle left)
● Output duration of one OB40 cycle (quick acknowledgement)
● Output during motion
The spindle-specific auxiliary function M5 (spindle stop) is always output at the end of the block.
The part program block that contains M5 is always ended with exact stop, i.e. even during
active continuous-path mode.
Synchronized actions
With output auxiliary functions from synchronized actions, the parameterized output behavior
is ignored except for the following parameters:
● Bit0: Output duration of one OB1 cycle (normal acknowledgement)
● Bit1: Output duration of one OB40 cycle (quick acknowledgement)
Auxiliary functions: M17 or M2/M30 (end of subprogram)
In its own part program block
If one of the auxiliary functions M17, M2 or M30 is programmed as the only auxiliary function
in a part program block and an axis is still in motion, the auxiliary function is not output to the
PLC until after the axis has stopped.
Overriding the parameterized output behavior
The parameterized output behavior of the auxiliary functions M17 or M2/M30 is overridden by
the output behavior that is determined in the following machine data:
MD20800 $MC_SPF_END_TO_VDI, bit 0 (subprogram end / stop to PLC)
Bit Value
0
Auxiliary function: M1 (conditional stop)
Overriding the parameterized output behavior
The parameterized output behavior of the auxiliary function M1 is overridden by the output
behavior defined in the following machine data:
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Meaning
0 The auxiliary functions M17 or M2/M30 (subprogram end) are not output to the PLC. Con‐
tinuous-path mode is not interrupted at the end of the subprogram
1 The auxiliary functions M17 or M2/M30 (subprogram end) are output to the PLC.
H2: Auxiliary function outputs to PLC
8.16 Supplementary conditions
443