Siemens SINUMERIK 840D Function Manual page 711

Path velocity
The path velocity in mm/min depends on:
● Handwheel pulses in each IPO clock cycle
● Pulse evaluation of the handwheel using machine data:
MD11322 $MN_CONTOURHANDWH_IMP_PER_LATCH
● Active increment (INC1, 10, 100, ...)
● Distance weighting of an increment of the first available geometry axis:
MD31090 $MA_JOG_INCR_WEIGHT
The path velocity is independent of:
● Programmed feedrate mode (mm/min, mm/rev.)
● Programmed path velocity
● Rapid traverse velocity for G0 blocks
● Override (with the exception of 0% override)
Traversing direction
The traversing direction depends on the direction of rotation of the handwheel:
● Clockwise rotation: Traversing the axes in the programmed direction.
If the block change criterion (IPO end) is reached, the program advances to the next block
(response identical to G60).
● Counterclockwise: Traversing the axes opposite to the programmed direction.
In this case, traversing is only possible up to the start of the actual block. Pulses are not
collected if the handwheel continues to rotate.
Activation of the function
The function can be activated via interface signals or in the NC program:
● Activation via interface signal
DB21, ... DBX30.0 - 2
● Activation via the NC program
Command FD=0 . The contour handwheel is switched on non-modally. This means in the
following block, the programmed velocity F... from the block before the contour
handwheel again applies when the contour handwheel is activated.
Note
An alarm is displayed if no feedrate was programmed in the previous NC blocks.
"Simulated contour handwheel" function
When the "Contour handwheel" function is active, using the "Simulated contour handwheel"
function, the handwheel or the handwheel pulses are simulated.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
H1: Manual traversing
17.13 Use of handwheels in automatic mode
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