Parameter Setting - Siemens SINUMERIK 840D sl Function Manual

H1: Manual travel and handwheel travel
4.10 Approaching a fixed point in JOG
Features of modulo rotary axes
Modulo rotary axes can approach the fixed point in both directions. The shortest path (DC) is
not observed during the travel.
Features of spindles
A spindle changes to the positioning mode on actuating the "Approaching fixed point in JOG"
function. The closed loop position control is active and the axis can traverse to the fixed
point.
If no zero mark is detected the alarm message in the axis operation is output:
Alarm 17810 "Channel %1 Axis %2 not referenced"
As a spindle must also be a modulo rotary axis at all times, the same conditions apply for
direction observation as for modulo rotary axes (refer to the paragraph "Features of modulo
rotary axes")
4.10.3

Parameter setting

Movement in the opposite direction
The response while traversing in the opposite direction, i.e.,against the direction of the
approaching fixed point depends on the setting of Bit 2 in the machine data:
MD10735 $MN_JOG_MODE_MASK (settings for the JOG mode)
Bit
2
Fixed point positions
A maximum of 4 fixed point positions can be defined for each axis via the following machine
data:
MD30600 $MA_FIX_POINT_POS[n]
Number of valid fixed point positions
The number of valid fixed point positions of an axis is defined via the machine data:
MD30610 $MA_NUM_FIX_POINT_POS
Note
"Approaching fixed point with G75/G751" constitutes an exception in this case. Two fixed
point positions can also be approached here in the setting MD30610 = 0.
334
Value Description
0 Travel in the opposite direction is not possible (default setting).
1 Movement in the opposite direction is possible.
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions