Siemens SINUMERIK 840C - Manual (Page 319)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 09.95
6.6.2 Spindle-specific MD bits (spindle bits)
These bits only affect following spindles and are active immediately
Bit 0-7 Switchover bit for emergency retraction
Bit 0-7=1 The corresponding bit in the output byte of the mixed I/O module is
switched from the normal state to the inverted state when an
emergency retraction has been triggered by this axis/spindle.
Bit 0-7=0 The corresponding bit in the output byte of the mixed I/O module
remains unchanged with an emergency retraction.
Comments:
The normal state is 1 (i.e. the condition after Power on, Reset) for all the bits of the mixed I/O
module.
If an axis/spindle triggers an emergency retraction, the bits defined in MD 528* change from 1
to 0.
Even if several axes/spindles trigger an emergency retraction simultaneously or in quick
succession and the same bit is marked for all of them, it only changes from the normal state to
error once. This is then maintained until the next Reset.
Example:
12 is set in MD 312
This means that the 2nd byte of the 1st mixed I/O module for the first mode group is used for
the emergency stop. After Reset all outputs of this byte are set to 1.
S1 (1st spindle) and S2 (2nd spindle) are defined as following spindles.
0001 0001 is set in MD 5280 and 001 0010 is set in MD 5281.
If spindle S1 detects that the emergency retraction threshold has been exceeded in follow-up
mode and emergency retraction has been enabled via PLC interface signal, bit 0 and bit 4 in
the mixed I/O module change from 1 to 0.
If spindle S2 then detects an emergency retraction, bit 1 additionally changes to 0. Bit 4 is
already at 0 and remains so.
With these switchover bits it is possible to output common signals for several spindles of one
mode group as well as spindle-specific signals.
7 6 5 4 3 2 1 0
Bit No.
NC MD
529*
Drive-
autonomous
ext. stop
and retract.
1)
Controlled
ext. stop
and retract.
1)
Trigger
alarm +
mode group
stop on
error 1)
Determining spindle-specific responses (spindle was the source of the response). Internal
spindle-specific responses
Bit 2 Bit 2=1 Drive-autonomous extended stopping and retraction enabled.
Bit 2=0 Drive-autonomous extended stopping and retraction disabled.
Bit 1 Bit 1=1 NC-controlled extended stopping and retraction enabled.
Bit 1=0 NC-controlled extended stopping and retraction disabled.
Bit 0 Bit 0=1 When a fault is detected an alarm and Mode Group Stop is triggered and, with
it, stopping as well as retraction is requested.
Bit 0=0 No alarm or Mode Group Stop is triggered if a fault is detected.
Active: At once
Note:
See functional description of ESR
_______
1) As from SW 4
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SINUMERIK 840C (IA)