Siemens SINUMERIK 828D Commissioning Manual page 298

Tool management
9.4 PLC Program Blocks
Synchronous acknowledgment
● Acknowledgment of the intermediate steps of a job (tool management registers the current
position changes of tools, part program must wait).
The tool management is informed of intermediate steps of a job by an intermediate
acknowledgment. In intermediate acknowledgments, only the target position of the
intermediate step is relevant. The source position is known from the job or the last
intermediate acknowledgment. During a tool change, two tools (new and old) can also be
acknowledged simultaneously. Intermediate acknowledgments are only possible before
the end acknowledgment.
● End acknowledgment of a job (part program can be continued)
An end acknowledgment is necessary for every job. The end acknowledgment allows the
part program to continue and frees up the job interface for new jobs. It should take place
as soon as possible (e.g. as soon as the new tool is in the spindle and a collision is no
longer expected). The tool management can be informed asynchronously of further steps
after the end acknowledgment of a job (e.g. the return path of the old tool into the magazine).
Asynchronous job-independent message
Position change of a tool or magazine ("asynchronous message", e.g. when the PLC changes
a tool position via machine control panel operation without tool change job).
An asynchronous message can be used to inform the tool management of a tool or magazine
movement, independently of a job. An asynchronous message must always contain a source
position (from) and target position (to).
Tool movements within a magazine (relocate tool) can only be carried out with magazine
locations which are actually occupied. Empty transfers are not permissible. Two asynchronous
transfers can be implemented in a single message. In this case the interface must be used for
tool change DB42xx.
Effect of acknowledgments
Effect of acknowledgments on the job and the part program:
● Intermediate and end acknowledgment take place synchronously with the job.
– The part program must wait.
– No new job can come yet.
● Message of an asynchronous transfer:
– The part program continues to run.
– The message is completely independent of any job.
284
Commissioning Manual, 10/2015, 6FC5397-3DP40-5BA3
CNC commissioning