Siemens SINUMERIK 840D Function Manual

Detailed description
2.4 LookAhead
Basic logic functions: Continuouspath Mode, Exact Stop, LookAhead (B1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
49
Special cases of LookAhead
Axis-specific feed stop and axis-specific axis disable are ignored by LookAhead.
If an axis is to be interpolated that should on the other hand be made stationary by axis-
specific feed stop or axis disable, LookAhead does not stop path movement before the block
in question but decelerates in the block itself.
If this response is not wanted, an axis-specific feed stop can be transferred to a channel via
the PLC to stop the path immediately.
See also:
/FB1/ Function Manual, Basic Functions; axis jamming(A3).

Siemens SINUMERIK 840D Specifications

General

Series	SINUMERIK 840D
Axes	Up to 31
Channels	Up to 10
Operating System	Windows-based
Power Supply	24 V DC
Control Unit Type	CNC
Interface	Ethernet, PROFIBUS
Display	TFT color display
Interpolation	Spline
PLC	Integrated PLC
Data Storage	CompactFlash, USB