Autonomous Singleaxis Operations - Siemens SINUMERIK 840D sl Function Manual

11.3.3

Autonomous singleaxis operations

Functionality
Single PLC axes, command axes started via static synchronized actions or asynchronous
reciprocating axes can be interpolated independently of the NCK. An axis/spindle interpolated
by the main run then reacts independently of the NC program with respect to:
● NC stop
● Alarm handling
● Program control
● End of program
● RESET
Boundary conditions
Axes/spindles currently operating according to the NC program are not controlled by the PLC.
Command axis movements cannot be started via non-modal or modal synchronized actions
for PLC-controlled axes/spindles. Alarm 20143 is signaled.
Transfer axis control to the PLC
Description of the sequence
1. PLC → NCK: Request to control the axis
2. NCK: Checks whether the axis is a main run axis or a neutral axis.
3. NCK: Checks whether an additional axis may be controlled from the PLC.
4. NCK confirms the transfer:
– DB31, ... DBX63.1 = 1 (PLC controls the axis)
– System variable $AA_SNGLAX_STAT = 1
Result: The PLC controls the axis/spindle.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
DB31, ... DBX28.7 = 1 (PLC controls axis)
11.3 Motion behavior and interpolation functions
P2: Positioning axes
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