Siemens SINUMERIK 840D sl Function Manual page 963

Interpolatory compensation
Mechanical deviations of the machine are compensated for by means of interpolatory
compensation functions, such as → leadscrew error, sag, angularity, and temperature
compensation.
Interrupt routine
Interrupt routines are special → subprograms that can be started by events (external signals)
in the machining process. A part program block which is currently being worked through is
interrupted and the position of the axes at the point of interruption is automatically saved.
Inverse-time feedrate
The time required for the path of a block to be traversed can also be programmed for the axis
motion instead of the feed velocity (G93).
JOG
Operating mode of the control (setup mode): The machine can be set up in JOG mode.
Individual axes and spindles can be traversed in JOG mode by means of the direction keys.
Additional functions in JOG mode include: → Reference point approach, → Repos, and → Preset
(set actual value).
Key switch
The key switch on the → machine control panel has four positions that are assigned functions
by the operating system of the controller. The key switch has three different colored keys that
can be removed in the specified positions.
Keywords
Words with specified notation that have a defined meaning in the programming language for
→ part programs.
KV
Servo gain factor, a control variable in a control loop.
Leading axis
The leading axis is the → gantry axis that exists from the point of view of the operator and
programmer and, thus, can be influenced like a standard NC axis.
Leadscrew error compensation
Compensation for the mechanical inaccuracies of a leadscrew participating in the feed. The
controller uses stored deviation values for the compensation.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Glossary
963