Siemens SINUMERIK 840D Programming Guide

13
12.98 Additional Functions
13.5 Extended sto
pp
in
g
and retract
(
as of SW 5
)
13
840D
NCU 571
840D
NCU 572
NCU 573
FM-NC 810D 840Di

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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
13-449
Retract (drive-independent)
Drive-independent retract is
• configured: via MD; time specification and return
velocity are set in MD, see "Example: Using the
drive-independent reaction" at the end of this
chapter,
• enabled: system variable $AA_ESR_ENABLE
• triggered: system variable $AN_ESR_TRIGGER.
13.5.2 Possible trigger sources
Function
The following error sources for starting "Extended
stop and retract" are possible:
•
General sources (NC-external/global or mode
group/channel-specific):
•
Digtial inputs (e.g. on NCU modules or
terminal blocks) or mapping the digital
outputs within the control ($A_IN, $A_OUT)
•
Channel status ($AC_STAT)
•
VDI signals ($A_DBB)
•
Group messages from a number of
alarms ($AC_ALARM_STAT)
•
Axial sources:
•
Emergency retraction threshold of the
following axis (synchronization of
electronic coupling,
$VA_EG_SYNCDIFF[following axis])
•
Drive: DC link warning threshold (pending
undervoltage), $AA_ESR_STAT[axis]
•
Drive: Generator minimum velocity
threshold (no more regenerative rotation
energy available), $AA_ESR_STAT[axis].

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