Siemens Sinumerik 840D sl Programming Manual page 198

Glossary
Interpolator
Logical unit of the -> NCK which can be used to determine the intermediate values for the
movements of the individual axes to be executed on the basis of the target positions
specified in the part program.
Interpolatory compensation
Interpolatory compensation is a means of compensating the leadscrew error (SSFK) and
measuring system error (MSF) that result from the production process.
Interrupt routine
Interrupt routines are special -> subprograms which can be started by events (external
signals) in the machining process. Here, the block of the part program just processed is
interrupted and the axis position at the interruption point is stored automatically. See ->
ASUP
Interrupts
All -> messages and alarms are displayed in plain text on the operator panel. The alarm text
contains the date, time and a suitable symbol for the cancel criterion.
Alarms and messages are displayed separately according to the following criteria:
● 1. Alarms and messages in the part program:
● 2. PLC alarms and messages that concern the machine can be displayed directly from
Inverse-time feedrate
In the SINUMERIK 840D controls, the speed of the axis motion can be specified (G93)
instead of the feedrate for traversing the distance stored in a block.
JOG
Operating mode of the CNC (in the setup operation): The machine can be setup in the JOG
mode. The individual axes and spindles can be traversed in steps (in the JOG mode) with
direction keys. Other functions offered by the JOG mode are -> Reference point approach, -
> REPOS (reposition) -> Preset -> (actual value specification).
Keyswitch
S7-300: In the S7-300, the key-operated switch is the mode selector switch in the -> CPU.
The key-operated switch is operated with a removable key.
840D: The key-operated switch on the -> machine control panel has 4 positions to which the
operating system of the control system has assigned appropriate functions. Each key-
operated switch has three differently colored keys, which can be removed in the specified
positions.
198
Alarms and messages can be displayed directly from the program as plain text.
the PLC in plain text format. No additional function blocks are required for this.
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling