Operator message display Screen used to inform the operator of the current machine status, and to display
prompts to the operator.
Optional block skip Adding a “/”, followed by a number, to the beginning of a block so that that block
can be selectively skipped.
Optional stop Miscellaneous functions for causing a program to pause when the “Optional
Stop” switch on the machine operator’s panel is set to the ON position.
Output ahead of T–code function Searching fhrough a machining program for T commands in the execution
sequence, starting from the beginning, and outputting the detected T commands
before executing the program. This function enables the machine to prepare for
Overall position display Simultaneous display of the current position and remaining distance in the work-
piece coordinate system, relative coordinate system, and machine coordinate
Override cancel Clamping a feedrate override value to 100%.
Override playback Storing a cutting feedrate override value and spindle speed override value during
the execution of a program. Restoring and using the override values when the
program is next executed.
Overtravel Decelerating and stopping a tool if it goes beyond a machine stroke end, and dis-
playing an alarm.
P/S alarm Alarm related to programs and manipulation.
Parallel axis Controlled axis (such as the U–, V–, or W–axis) parallel to the X–, Y–, or Z–axis,
Parallel operation Operation mode in which a move command for a certain program axis is used
to simultaneously feed two or more controlled axes (parallel axes) having the
same name. A parallel axis is represented using a combination of the same axis
name address as for the corresponding basic axis and a number (such as X1,
X2, and so on).
Parameter Data (such as feedrate, coordinate system, spindle, and tool parameters) set in
the CNC to define its specifications.
Part program Sequence of instructions created using a language and format that support the
direct manipulation of the CNC. Alternatively, a sequence of instructions pre-
pared as input data to be processed during automatic programming.
Part program storage length Size of a program that can be stored in CNC memory as an equivalent paper tape
length (number of characters x 2.54 mm).
Password function Disabling the editing of specific programs (such as those identified by program
number 09000 to 09999).
Pattern data input Simplified programming in which menus are used to set numeric data (pattern
date), based on drawings, in the CNC.
Pattern function Punching at two or more positions arranged in a known layout, using a single
Pattern storage and recall Pattern function in which codes A1 to A5 are assigned to patterns of the same
figure, storing them, and restoring them using codes B1 to B5 when necessary.
PDP/MDI Panel which incorporates both a plasma display panel (PDP) and a manual data
input (MDI) keyboard. Used to display and set programs and data in the CNC.
Pitch error compensation Compensating for pitch errors in a mechanical feed section.
Plane conversion function Machining in which a machining program created on a G17 plane is converted
so that the resulting figure looks the same when viewed from another plane in
an orthogonal coordinate system.
Plane selection Selecting a plane for circular interpolation, a plane for cutter compensation, a
plane for coordinate system rotation, or a plane for hole machining, using a pre-
Playback function Programming in which a command assumes that a position to which the tool is
moved manually is that command’s target tool position.