6 NC Machine Data (NC MD), NC Setting Data (NC SD) 01.99
6.6.2 Spindle-specific MD bits (spindle bits)
6.6.2 Spindle-specific MD bits (spindle bits)
76543210
Bit No.
NC MD
520*
Spindle
override
active for
thread cutting
No M19
abort on
RESET
M19 with
axis
movement
M19
oriented
spindle stop
Speed in
0.1 rev/
min units
Encoder
available
Actual
value sign
change
Default value
MD 840C (T) 840C (M)
5200 0000 0100 0000 0000
5201 - 5205 0000 0000 0000 0000
Active: On NC STOP
Bit 7 Bit 7=1 When this bit is set, a change in the following error (due to a change in the
spindle speed) results in a thread fault!
Note:
Only the leading spindle of the channel may be programmed before first programming and
during activated G33, G96 and G97.
Bit 6 Bit 6=1 M19 is active until the "Acknowledge M19" interface signal is generated,
without regard to RESET (or to M02/M30 etc.).
(Refer also to the Section entitled ”Axis (Analog) and Spindle Installation”.)
Bit 5 Bit 5=1 No waiting for positioning of the main spindle; instead, the next program block
(which might include axis movement) is executed when M19 is output to the
PLC. Positioning (M19) is also terminated with an M3 or M4 in the part
program.
Bit 5=0 No acknowledgement with M3 or M4 (block search)
Bit 4 Bit 4=1 Oriented spindle stop
When this bit is set, the NC can stop the spindle at specific positions. S
analog and encoder are required. See Section 6.
Bit 3 Bit 3=1 The programmed S word is given the dimension 0.1 rev/min, i.e. the speed
range lies between 0.1 rev/min and 1600 rev/min. This bit is required for actual
speed monitoring only; the spindle setpoint (speed) is specified in NC MD
403* to 410*. The actual value is always displayed in whole revolutions. For the
actual spindle speed monitor, the minimum speed is always approximately 2
rev/min for the 0.1 rev/min and 1 rev/min settings.
Note:
When using this bit it should be noted that a value is entered in MD 403* that is 10 times
greater.
6–124 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)