Siemens Sinumerik 840DiE sl - Page 367

01/2007
11.5 Axes and spindles
11-367
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) -- 01/2007 Edition
The machine data
S MD35020: SPIND_DEFAULT_MODE (spindle park position)
S MD35030: SPIND_DEFAULT_ACT_MASK (effective time of spindle park
position)
can be used to define the default mode of a spindle at a defined time:
NC--START 1
Power ON 0
RESET 2
Speed mode w/o pos. contr.
Speed mode with pos. contr.
Positioning mode
Axis mode
0123
Standard setting
MD35020: SPIND_DEF AULT_MODE
MD 35030: SPIND_DEF AULT_ACT_MASK
Fig. 11-26 Default setting of spindle mode
It is possible to switch directly from spindle mode to axis mode provided the
same drive is used for both modes.
1. Transition to axis mode by programming the spindles using their axis names
or by M70.
2. If the axis is not synchronized, e.g. position control enabled with M70, the
axis has to be referenced with G74 first. Only then does the mechanical
position match the programmed one.
3. It is switched over to the current feedforward control mode marked by the
machine data and commands FFWON and FFWOF.
The following characteristics apply to the axis mode of a spindle:
1. The feed override switch is active.
2. IS ”Reset” (DB21, ... DBX7.7) does not
terminate axis mode as standard.
3. The interface signals DBB16 to DBB19 and DBB82 to DBB91 in DB31, ...
are of no significance if the IS ”Axis/no spindle” (DB31, ... DBX60.0) is set to
zero.
4. Axis mode can be activated in all gear steps. If the position actual value en-
coder is installed on the motor (indirect measurement system), the position-
ing and contouring accuracy can vary for the different gear stages.
Default
mode
Axis mode
Special features
11
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