Siemens SINUMERIK 840D sl Function Manual page 781

● The following syntax applies for the position end of positioning spindles:
Command axes
Command axes respond immediately to any reprogramming; therefore, programming should
not be changed. Each individual axis has its own axis interpolator and its own feedrate. An
axis cannot be moved from the part program and from synchronized actions simultaneously.
The FINEA, COARSEA and IPOENDA end-of-motion criteria are applicable for the transition to
a neutral axis. The axis can then be used via the NC program, for example, as a PLC axis.
Reciprocating axes
Reciprocating axes always brake at their reversal position and then move in the opposite
direction. Therefore, reciprocating axes do not require an expansion.
Note
The behavior of PLC axes at block changes is described in Section "Control by the PLC".
For further information about block changes with programmed end-of-motion criteria FINEA,
COARESA and IPOENDA, please refer to:
References:
/FB1/ Function Manual, Basic Functions; Spindles (S1), Section "Spindle modes"
/FB1/ Function Manual, Basic Functions; Feedrates (V1), Section "Programmable dynamic
response of single axes"
IPOBRKA
When the NC command IPOBRKA is issued, the end-of-motion criterion is activated in the
braking ramp either
● in the part program: Block change in the part program or
● in synchronized action: Technology cycles
With SW 6.2 and higher,type 2 positioning axis behavior differs from that in previous
software versions as follows:
If POSA is programmed, then POSA again with IPOBRKA (block change in the braking ramp),
an alarm is not issued. The new POSA motion waits for the preceding POSA motion to have
reached the block change point in the braking ramp.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
FINEA[Sn]: "Exact stop fine" motion end or
COARSEA[Sn] "Exact stop coarse" motion end or
IPOENDA[Sn]: End of motion when "IPO stop" is reached
Sn : Spindle number, 0 ... max. spindle number or
Axis: Axis identifiers X, Y, Z.
Positioning Axes (P2)
11.6 Block change
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