Siemens SINUMERIK 840D sl, Function Manual

Page: 1760 / 2184

Detailed description
2.3 Feedrate control
Basic logic functions: Feeds (V1)
44
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Priorities
The signals are scanned in ascending order starting at
I0
.
Therefore, the retraction motion (
SR
) has the highest priority and the feedrate
F7
the lowest
priority.
SR
and
ST
end the feedrate motions that were activated with
F2
-
F7
.
SR
also ends
ST
, i.e., the complete function.
The highest-priority signal determines the current feedrate.
Machine data:
MD21230 MULTFEED_STORE_MASK
(store input signals for the "Multiple feedrates in one block" function)
can be used to define the response on loss of the highest-priority input in each case (
F2
-
F7
).
The endofblock criterion is satisfied when:
•
The programmed end position is reached
•
The retraction motion ends (
SR
)
•
The dwell time elapses (
ST
)
Delete distance-to-go
A retraction motion or dwell time causes the distancetogo to be deleted.
Hardware assignment
The channel-specific machine data:
MD21220 MULTFEED_ASSIGN_FASTIN
(assignment of the input byte of the NCK I/Os for "Multiple feedrates in one block")
can be used to assign up to two digital input bytes or comparator input bytes to the NCK I/O.
Machine data:
MD21220 MULTFEED_ASSIGN_FASTIN
can also be used to invert the input bits.
If a 2nd byte is entered, the contents of the 1st and 2nd byte are ORed before being used.