Instructions

CL170 Math (Decimal)Math (Decimal)Math (Decimal) is a ladder-program instruction that evaluates a user-defined formula using decimal values and stores the result in a memory address. The formula is built on a Math dialog using a keypad and address picker, and parenthetical expressions can be nested up to eight levels. If floating point is used in any operation, all operations use floating-point math, and the result is converted to the data type of the assigned memory address.
CL171 Drum Instruction: Time BaseCL171 Drum Instruction: Time BaseThe Drum instruction simulates an electromechanical drum sequencer. It sequences through 1 to 16 steps and turns ON up to 16 physical outputs or internal control relays in a user-defined pattern. With Time Base selected, each step advances automatically after its specified Duration elapses, and a Completion Flag turns ON when the sequence completes.
CODESYS ASINASINASIN is an IEC operator in the CODESYS Development System that yields the arcsine value of a number. The input variable can be any numeric basic data type, and the output is returned as REAL or LREAL. The document's example is q := ASIN(0,5); which gives the result 0.523599.
CODESYS ATANATANATAN is an IEC operator in the CODESYS Development System that returns the arctangent of a number. The result is computed in radians. It can be written in ST (for example q := ATAN(0.5);) or placed as a block in FBD.
CODESYS CONCATCONCATCONCAT is a function in the CODESYS Standard library that joins two strings into one. It takes two STRING(255) inputs, STR1 and STR2, and returns a single STRING(255) containing STR1 immediately followed by STR2. In the documented example, CONCAT('SUSI','WILLI') returns 'SUSIWILLI'.
CODESYS CTDCTDCTD is a standard function block that decrements a counter value. A rising edge on the CD input reduces the current counter value CV by one, and LOAD set to TRUE loads CV with the start value PV. The output Q is TRUE when CV equals zero.
CODESYS CTUCTUCTU is a function block that increments a counter value. A rising edge on CU increases CV by one, RESET=TRUE sets CV to 0, and PV sets the upper limit for incrementing. Output Q is TRUE when CV is greater than or equal to PV.
CODESYS CTUDCTUDCTUD is a function block in the CODESYS Standard library that increments and decrements a given value. A rising edge on CU increments CV by one, and a rising edge on CD decrements CV by one. RESET sets CV to 0, LOAD sets CV to PV, QU is TRUE when CV >= PV, and QD is TRUE when CV = 0.
CODESYS DELETEDELETEDELETE is a standard string function in the CODESYS Standard library. It removes a given number of characters from a string, starting at a specified position, and returns the remaining string as a STRING(255) value. It is written as DELETE(STR, LEN, POS) and is used in structured text programs.
CODESYS FINDFINDFIND is a CODESYS Standard library string function declared as FUNCTION FIND : INT. It searches for the first occurrence of substring STR2 in string STR1 and returns the character position. If STR2 is not found in STR1, it returns 0.
CODESYS F_TRIGF_TRIGF_TRIG is a function block that detects a falling edge of a Boolean signal. It has a Boolean input CLK and a Boolean output Q; Q becomes TRUE when a falling edge is detected. The source shows Structured Text declaration and call examples using an instance of the function block.
CODESYS GTGTGT is an IEC operator that performs the greater-than comparison. It returns TRUE if the first operand is greater than the second operand; otherwise it returns FALSE. The document shows an ST example with the result FALSE.
CODESYS LEFTLEFTLEFT is a string function that returns a specified number of characters from the start of a string. It takes a STRING(255) input and an INT size, and returns a STRING(255); LEFT('SUSI',3) returns 'SUS'.
CODESYS LIMITLIMITLIMIT is an IEC selection operator in the CODESYS development system that limits a value to a range. It is written as OUT := LIMIT(Min, IN, Max) and is equivalent to OUT := MIN(MAX(IN, Min), Max), so a value above Max returns Max and a value below Min returns Min. The source gives the example Var1 := LIMIT(30,90,80); which returns 80.
CODESYS LNLNLN is an IEC operator that calculates the natural logarithm of a numeric input. It accepts any numeric basic data type as input and returns a REAL or LREAL result. For example, LN(45) yields approximately 3.80666.
CODESYS LTLTLT is an IEC comparison operator that performs the "less than" function. If the first operand is less than the second operand, the operator yields TRUE; otherwise it yields FALSE. The operands may be of any basic data type.
CODESYS MAXMAXMAX is an IEC operator that returns the greatest value among its inputs. It is written as OUT := MAX(IN0, IN1, IN2, ...). The CODESYS example MAX(30,90,40) returns 90, and nested MAX calls are also shown.
CODESYS MIDMIDMID is a string function in the CODESYS Standard library that returns a specified number of characters from a string, starting from a given position. It is called as MID(STR, LEN, POS): take LEN characters from STR beginning with the character at position POS, and return the partial string. The function is declared as FUNCTION MID : STRING(255).
CODESYS MOVEMOVEMOVE is an IEC operator that assigns the value of one variable to another variable of a corresponding type. In CODESYS it can be used in CFC, FBD, and LD editors, where EN/ENO functionality can control whether the assignment occurs. In structured text, ivar2 := MOVE(ivar1); is equivalent to ivar2 := ivar1;.
CODESYS NENENE is an IEC 61131-3 operator in the CODESYS Development System that compares two operands for inequality. It returns TRUE when the operands are unequal and FALSE when they are equal. Any elementary data type can be used for the operands.
CODESYS NOTNOTNOT is an IEC bitwise operator that inverts each bit of its operand. An input bit of 0 produces an output bit of 1, and an input bit of 1 produces 0. It is written in Structured Text as, for example, Var1 := NOT 2#1001_0011; and can also be represented in FBD.
CODESYS RIGHTRIGHTRIGHT is a string function that returns a specified number of characters from the right side of an input string. RIGHT(STR, SIZE) returns the first SIZE characters from the right in STR. Its return type is STRING(255), and it is used in structured text programs.
CODESYS ROLROLROL is an IEC operator in CODESYS that performs a bitwise rotation of an operand to the left. It moves the input value n bit positions to the left and places the bits shifted out of the leftmost position back in from the right. The result is assigned to an output variable; permitted data types are BYTE, WORD, DWORD and LWORD.
CODESYS R_TRIGR_TRIGR_TRIG is a function block in the CODESYS Standard library that detects a rising edge of a boolean signal. A declared instance is called with the boolean signal to be checked connected to the CLK input. The Q output is TRUE when a rising edge is detected.
CODESYS SHLSHLSHL is an IEC operator that shifts the bits of an operand to the left by a specified number of positions. It is written as erg := SHL(in, n), where in is the value to shift and n is the number of bit positions. The result is assigned to erg.
CODESYS SHRSHRSHR is an IEC bitwise shift operator that moves the bits of an operand to the right by a given number of places. It is written as erg := SHR (in, n), where in is the operand being shifted and n is the number of bit positions to shift. The result is assigned to the output variable erg, as shown in the structured text example where 16#45 shifted right by 2 gives 16#11.
CODESYS SINSINSIN is an IEC 61131-3 operator that returns the sine of a number. The input is an angle expressed in radians and may be any numeric basic data type, while the result is written to a REAL or LREAL variable. It is shown in a structured text assignment and in FBD.
CODESYS SQRTSQRTSQRT is an IEC operator in the CODESYS development system that returns the square root of a number. The input may be any numeric basic data type, while the output must be REAL or LREAL. The document's example computes the square root of 16, giving 4, and shows the call in ST and FBD.
CODESYS SRSRSR is a standard function block that implements a bistable set-dominant latch. The output Q1 is set to TRUE by the input SET1 and reset to FALSE by the input RESET, with SET1 taking priority. The implementation is the Boolean expression Q1 := SET1 OR (NOT RESET AND Q1).
CODESYS TONTONTON is a function block that implements an on-delay timer. A rising edge on IN starts the delay counter, and Q becomes TRUE after the delay time PT has elapsed while IN remains TRUE. A falling edge on IN resets the delay counter.
CODESYS TRUNCTRUNCTRUNC is an IEC operator in the CODESYS Development System that converts a REAL value into the DINT data type. It keeps only the integer part of the number, discarding the fractional part. For example, TRUNC(1.9) gives 1 and TRUNC(-1.4) gives -1.
CODESYS XORXORXOR is an IEC operator that performs a bitwise exclusive OR on bit operands. For two input bits, the output is 1 only when exactly one input is 1; if both inputs are 1 or both are 0, the output is 0. The operator is permitted for BOOL, BYTE, WORD, DWORD and LWORD data types.
CounterCounterThe Counter instruction counts up, down, or both in response to OFF-to-ON transitions of enabling rungs. It stores the current count in a register and turns on a completion bit when the count reaches the set point. A reset rung clears the completion bit.
G70 Lathe finishing cycleG70G70 is a lathe finishing cycle that follows a profile defined in the subroutine number given by Q. It is intended to run after the profile has been cut with G71 or G72. The cycle moves to the start of the profile, follows it with G1 and G2/G3 moves, and can repeat the profile for multiple finishing passes.
LinuxCNC F: Set Feed RateFF sets the feed rate to x, usually in machine units per minute. The feed rate application follows the Feed Rate Section unless inverse time feed rate mode or feed per revolution mode is in effect.
LinuxCNC G02G02G02 is a LinuxCNC G-code that commands a clockwise circular or helical arc at the current feed rate, the direction being viewed from the positive end of the axis about which the motion occurs. The arc is programmed either in center format, giving the endpoint plus I, J, K offsets to the arc centre, or in radius format using the R word. The arc axis and plane are chosen with G17, G18 or G19.
LinuxCNC G1 Linear MoveG1G1 is a G-code instruction that commands a coordinated straight-line move to a destination point at the current feed rate, or slower. It is used for linear motion for cutting or non-cutting moves. Axis words specify the destination, and any omitted axes keep their previous values.
LinuxCNC G10 L0 Reload Tool Table DataG10 L0G10 L0 is a LinuxCNC G-code that reloads all tool table data. It requires that no tool is currently loaded in the spindle. When executed, tool parameters #5401-#5413 update immediately, altered tool diameters apply to later G41/G42 cutter radius compensation, and existing G43 tool length compensation values remain in effect until updated by a new G43 command.
LinuxCNC G10 L1 Set Tool TableG10 L1G10 L1 sets the tool table entry for a specified tool number to the values given in the command. It rewrites and reloads the tool table for that tool. The command can set tool radius and, on lathes, front angle, back angle and orientation.
LinuxCNC G10 L10 Set Tool TableG10 L10G10 L10 changes the tool table entry for tool P so that, with the machine at its current position and the current G5x and G52/G92 offsets active, the current coordinates of the given axes become the given values after the tool offset is reloaded. Axes not named in the command are not changed. The document notes it can be useful together with a probe move as described in the G38 section.
LinuxCNC G10 L2G10 L2G10 L2 sets the origin of a numbered coordinate system in LinuxCNC by writing axis offsets measured from the machine origin established during homing. The P word selects the coordinate system (0 to 9) and the axis words give the new offset values, which replace existing offsets for the axes named; optional R sets rotation of the XY axes about Z. It only writes the offsets and does not switch the active coordinate system.
LinuxCNC G10 L20 Set Coordinate SystemG10 L20G10 L20 sets a coordinate system offset to a calculated value so that the current axis coordinates become the programmed values. It uses a P word to choose a coordinate system from 0 to 9 and axis words for the coordinates to set. The document gives G10 L20 P1 X1.5 as an example.
LinuxCNC G17 Plane Select XYG17G17 is a LinuxCNC G-code that sets the current working plane to XY, which is also the default plane. The selected plane determines the orientation of circular arcs in G2/G3 and the axis used by the canned cycles G81 to G89. The document recommends placing a plane selection command in the preamble of each G-code file.
LinuxCNC G17.1G17.1G17.1 is a LinuxCNC plane-selection G-code. It sets the active plane to UV. The UV, WU and VW planes do not support arcs.
LinuxCNC G19G19G19 is the plane-selection G-code that sets the active plane to YZ. It belongs to the G17-G19.1 plane-select group in LinuxCNC. The selected plane is used by arc moves and canned cycles.
LinuxCNC G19.1 Plane Select VWG19.1G19.1 is a LinuxCNC G-code that selects the VW plane as the current machining plane. Plane selection determines the plane used by operations such as arc motion and canned cycles. The document states that the VW plane does not support arcs.
LinuxCNC G20G20G20 is a G-code instruction that selects inches for length units in a program. The manual recommends including unit selection in the preamble of each G-code file.
LinuxCNC G21 Units: millimetersG21G21 is a G-code command that selects millimeters as the length unit for a program. It is used in the preamble so subsequent length values are interpreted in millimeters.
LinuxCNC G28 Go to Predefined PositionG28G28 is a LinuxCNC G-code that makes a rapid move to a predefined absolute machine position stored in parameters. With axis words, it first rapid-moves to the programmed position including offsets, then rapid-moves to the stored predefined position for the specified axes. It is intended for use when the machine is homed to a repeatable position and a G28 position has been stored with G28.1.
LinuxCNC G28.1G28.1G28.1 is a LinuxCNC G-code that stores the current absolute position into parameters 5161-5166. It is used to set the predefined position that G28 later moves to.
LinuxCNC G3G3G3 is the LinuxCNC G-code for a circular or helical arc move in the counterclockwise direction at the current feed rate. The arc is specified either by its end point plus offsets to the arc center (center format) or by its end point plus a radius (radius format), in the plane chosen with G17, G18 or G19. Including the axis word perpendicular to the selected plane produces a helical move.
LinuxCNC G30G30G30 is a LinuxCNC G-code that makes a rapid move from the current position to a predefined absolute position stored in parameters 5181-5189. Optionally, axis words given with G30 first move those axes to the programmed point (including offsets), then the specified axes rapid to the stored position; axes not named do not move. It functions like G28 but uses the second set of stored parameters.
LinuxCNC G30.1G30.1G30.1 is a LinuxCNC G-code that stores the current absolute position into parameters 5181-5186. The stored values form the predefined position used by the G30 command, which makes a rapid move to the values held in parameters 5181-5189 for all axes defined in the INI file. If no position has been stored with G30.1, a G30 move sends all axes to the machine origin.
LinuxCNC G33G33G33 is a LinuxCNC G-code that commands spindle-synchronized motion along one direction, where the K word gives the distance moved in XYZ per revolution of the spindle. Motion waits for the spindle index and spindle-at-speed signals so that repeated passes line up, and it ends at the programmed endpoint. It is used for threading, tapered threads and similar operations where the tool must track spindle rotation.
LinuxCNC G33.1 Rigid TappingG33.1G33.1 is a LinuxCNC G-code for rigid tapping, a spindle-synchronized motion with return. It moves to the specified coordinate in synchronization with the selected spindle, reverses the spindle at the endpoint, returns to the original coordinate, and reverses the spindle again. K sets the distance moved per spindle revolution, and I and $ optionally set a return-speed multiplier and select the spindle.
LinuxCNC G38.3 Straight Probe Toward WorkpieceG38.3G38.3 is a LinuxCNC G-code for a straight probing move toward the workpiece. The controlled point moves in a straight line at the current feed rate toward the programmed point and stops when the probe input changes to the touched state or the programmed point is reached, whichever occurs first. Unlike G38.2, it does not signal an error if the probe is not tripped before the destination.
LinuxCNC G38.4G38.4G38.4 is a LinuxCNC G-code straight-probe instruction that moves away from the workpiece at the current feed rate until the probe loses contact. It stops on loss of contact and signals an error if loss of contact is not detected before the programmed destination is reached. At least one axis word defines the destination point.
LinuxCNC G38.5G38.5G38.5 is a LinuxCNC straight-probe G-code that moves the controlled point in a straight line at the current feed rate away from the workpiece. It stops when the probe input changes to the untouched state (loss of contact) or when the programmed endpoint is reached, whichever happens first. It does not signal an error if the probe fails to change state before the endpoint.
LinuxCNC G4 DwellG4G4 is a dwell command in LinuxCNC G-code. It pauses all axis motion for the time given by the P word in seconds. It does not affect spindle, coolant, or I/O.
LinuxCNC G40 Compensation OffG40G40 is the LinuxCNC G-code that turns cutter compensation off. If cutter compensation was active, the next programmed move must be a linear move longer than the tool diameter. Programming G40 when compensation is already off is accepted.
LinuxCNC G41.1G41.1G41.1 is a LinuxCNC G-code that turns on dynamic cutter compensation to the left of the programmed path, as viewed from the positive end of the axis perpendicular to the active plane. It works like G41 but also lets the program supply the tool diameter with the D word, and optionally the tool orientation with the L word. The L word defaults to zero when it is omitted.
LinuxCNC G42.1 Dynamic Cutter Compensation RightG42.1G42.1 is a LinuxCNC G-code that turns on dynamic cutter compensation to the right of the programmed path, with the cutter diameter given by the D word. It works like G42 but also lets the program specify the tool diameter directly; the optional L word sets tool orientation and defaults to 0.
LinuxCNC G43G43G43 is a LinuxCNC G-code that enables tool length compensation. It offsets subsequent axis coordinates by the stored tool length and does not cause motion; the next compensated axis move uses the compensated endpoint. G43 without H uses the currently loaded tool from the last Tn M6, while G43 Hn uses the offset for tool n.
LinuxCNC G43.1 Dynamic Tool Length OffsetG43.1G43.1 is a LinuxCNC G-code that dynamically replaces the current tool length offset values for the specified axes. It does not cause motion; the next move of a compensated axis uses the new offset. The change is not written to the tool table.
LinuxCNC G43.2G43.2G43.2 applies an additional simultaneous tool length offset to subsequent motions. It can add the offset of tool number Hn or add the value(s) of axis words. G43.2 itself does not cause motion; the next move of a compensated axis uses the compensated endpoint.
LinuxCNC G5 Cubic SplineG5 Cubic SplineG5 creates a cubic B-spline in the XY plane using only the X and Y axes. P and Q give the second control point as offsets from the end point and must both be specified. I and J give the first control point as offsets from the start point; on later G5 commands they can be omitted so the spline continues smoothly from the previous cubic.
LinuxCNC G5.1G5.1G5.1 creates a quadratic B-spline in the XY plane using only the X and Y axes. I and J are incremental offsets from the start point to the control point on the X and Y axes respectively. An unspecified I or J offset is zero, so at least one of I or J must be given.
LinuxCNC G5.2G5.2G5.2 opens a NURBS data block in LinuxCNC. The lines between G5.2 and G5.3 define control points with optional weights, and the current position before the first G5.2 is taken as the first control point. Optional P and L words set control-point weights and the curve order, with defaults of 1 and 3.
LinuxCNC G5.3G5.3G5.3 is the LinuxCNC G-code that closes a NURBS data block. It is programmed on its own line after a G5.2 block, and the lines between G5.2 and G5.3 define the curve control points together with their weights (P) and the parameter L that sets the curve order. G5.3 takes no axis words or other arguments.
LinuxCNC G56G56G56 is a LinuxCNC G-code that selects coordinate system 3, the third of the nine stored workpiece coordinate systems G54 through G59.3. The axis offsets and the XY rotation angle around Z for that coordinate system are read from saved parameters, so subsequent axis words are interpreted in coordinate system 3.
LinuxCNC G59.1G59.1G59.1 selects coordinate system 7 in LinuxCNC. It is one of the G54 through G59.3 coordinate system selection codes. The selected coordinate system stores axis values and an XY rotation angle around the Z axis.
LinuxCNC G59.2G59.2G59.2 is a LinuxCNC G-code that selects coordinate system 8. It belongs to the G54–G59.3 group of coordinate system selection codes. The selected coordinate system stores axis values and an XY rotation angle around the Z axis.
LinuxCNC G59.3G59.3G59.3 is a LinuxCNC G-code that selects coordinate system 9 for subsequent motion. Each coordinate system holds axis offsets and an XY rotation angle about the Z axis that are applied to programmed coordinates. The stored values for system 9 are set with G10 L2 or G10 L20.
LinuxCNC G61G61G61 is a LinuxCNC G-code that selects exact path mode. In this mode the tool follows the programmed path exactly, slowing down or stopping as needed to reach every programmed point. If two sequential moves are exactly co-linear, movement does not stop between them.
LinuxCNC G61.1 Exact Stop ModeG61.1G61.1 is the exact stop mode G-code. When active, movement stops at the end of each programmed segment.
LinuxCNC G64G64G64 is a LinuxCNC path control mode that blends motion for speed instead of stopping exactly at each programmed point. Programmed with a P tolerance, the actual path may deviate from the programmed endpoint by no more than P, and velocity is reduced as needed to hold that deviation. An optional Q value turns on the Naive CAM Detector, which collapses nearly collinear feed moves into a single linear move.
LinuxCNC G7G7G7 is a LinuxCNC G-code that puts the X axis of a lathe into diameter mode. In diameter mode an X axis move is half the distance to the centre of the lathe, so programming X1 moves the cutter to 0.500" from the centre and produces a 1" diameter part.
LinuxCNC G71G71G71 is a LinuxCNC lathe roughing cycle that removes material in layers along Z to rough-cut a profile defined in a subroutine. The subroutine number is given by Q, and optional X and Z set the starting position, D the remaining distance, I the cutting increment, and R the retracting distance. It requires the ZX plane and is intended to leave material for a finishing cycle.
LinuxCNC G72 Lathe Facing Roughing CycleG72G72 is a LinuxCNC lathe roughing cycle for facing: it removes material by traversing along the X axis, following a profile defined in a subroutine selected by Q. X and Z set the start position, D leaves distance for finishing, I sets the cutting increment, and R sets the retracting distance. The profile path must change monotonically in X.
LinuxCNC G74 Left-hand Tapping Cycle with DwellG74G74 is a LinuxCNC G-code cycle for left-hand tapping with a floating chuck. It moves the Z axis at the programmed feed rate to the Z position, stops the selected spindle, starts clockwise spindle rotation, dwells for P seconds, and feeds back to clear Z. The document states that G74 does not use synchronized motion.
LinuxCNC G76G76G76 is a multi-pass lathe threading cycle in LinuxCNC. The tool starts from an initial X and Z position, follows a drive line through the initial X parallel to Z, and cuts a thread using pitch, thread peak offset, initial cut depth, full thread depth, and optional degression, compound slide angle, spring pass, taper, and spindle settings. At the end of the cycle the tool is at the specified Z position.
LinuxCNC G80G80G80 is a LinuxCNC G-code that cancels canned cycle modal motion. It belongs to modal group 1, so programming any other G-code from that group also cancels the canned cycle. After G80, motion must be turned back on with a motion mode word such as G0 before further axis moves.
LinuxCNC G81 Drilling CycleG81G81 is a canned drilling cycle in LinuxCNC G-code. It moves to the programmed position in the selected plane, feeds the tool along the perpendicular axis to the programmed depth, then rapids to the clear Z position. The L word repeats the cycle.
LinuxCNC G82 Drilling Cycle, DwellG82G82 is a LinuxCNC canned cycle for drilling that pauses, or dwells, at the bottom of the hole before retracting. It drills at the current feed rate to the Z position, holds for the time given by the P word, then rapids back to clear Z. It behaves like G81 with the added dwell.
LinuxCNC G84 Right-hand Tapping Cycle, DwellG84G84 is a canned cycle for right-hand tapping with a floating chuck and a dwell at the bottom of the hole. The cycle feeds the Z axis to the programmed depth, stops the selected spindle, starts counterclockwise spindle rotation, dwells for the P time, then feeds back to clear Z. It does not use synchronized motion.
LinuxCNC G85G85G85 is a LinuxCNC canned cycle for boring or reaming; it can also be used for drilling or milling. After the common preliminary motion, the Z axis feeds to the programmed Z position, retracts at feed rate to the R plane when that plane is lower than the initial Z, and then retracts at traverse rate to clear Z.
LinuxCNC G86G86G86 is a LinuxCNC canned boring cycle. It feeds the Z axis to the programmed depth, dwells for P seconds, stops the selected spindle, rapid-retracts to clear Z, then restarts the spindle in its previous direction.
LinuxCNC G87G87G87 is the back boring canned cycle in the LinuxCNC G-code set, listed in the G80-G89 canned cycle group. In this implementation the code is unimplemented: LinuxCNC accepts G87 but does not define what it does, so its behaviour is undefined.
LinuxCNC G88 Boring Cycle, Spindle Stop, Manual OutG88G88 is listed in the LinuxCNC canned cycle group as a boring cycle that stops the spindle and moves the tool out under manual control. The LinuxCNC documentation states that the code is accepted by the interpreter but is currently unimplemented, so its behavior is undefined. The general canned cycle sections define the common words, sticky words, repeat, retract mode and error conditions that apply to cycles G81 through G89.
LinuxCNC G89 Boring Cycle, Dwell, Feed OutG89G89 is a canned boring cycle. It feeds the Z axis to the programmed depth at the current feed rate, dwells for P seconds, then retracts at the feed rate to clear Z. It is programmed with position and R retract values, and L can repeat the cycle.
LinuxCNC G90G90G90 selects absolute distance mode in LinuxCNC. In this mode, axis numbers for X, Y, Z, A, B, C, U, V, and W usually represent positions in the currently active coordinate system rather than increments from the current position. Exceptions are described in the canned cycle section.
LinuxCNC G90.1G90.1G90.1 selects absolute arc distance mode in LinuxCNC, so the I, J and K arc center offsets in G2/G3 blocks are measured as absolute distances from the current 0 position of the axis rather than from the arc start point. In this mode both offsets for the active plane must be programmed: I and J for the XY plane, or J and K for the XZ plane. Incremental offsets, which are the default, are restored with G91.1.
LinuxCNC G91.1G91.1G91.1 is the LinuxCNC G-code that selects incremental arc distance mode for the I, J and K offsets used with G2 and G3 arc moves. In this mode the arc centre offsets are distances relative to the start location of the arc. G91.1 returns I, J and K to their default behaviour, which is incremental arc distance mode.
LinuxCNC G92 Coordinate System OffsetG92G92 is a LinuxCNC G-code that sets the current controlled point to the coordinates given by its axis words without producing motion. It does this by shifting the origins of all coordinate systems so the current point takes the specified value, and stores the resulting per-axis offsets in parameters 5211-5219. At least one axis word is required; axes not named receive a zero offset.
LinuxCNC G92.1G92.1G92.1 is a LinuxCNC G-code that turns off any active G92 coordinate system offsets and clears the stored offset parameters 5211 through 5219 to zero. It is used to erase offsets left over from a previous program so they are not reused. It affects only G92 offsets, not the G53-G59.3 coordinate system offsets.
LinuxCNC G92.2G92.2G92.2 is a LinuxCNC G-code that turns off the G92 coordinate system offsets currently in effect. Unlike G92.1, it does not clear the stored offset values; parameters 5211 to 5219 remain available so the offsets can be restored later with G92.3. It is used to remove a temporary G92 origin shift between runs or programs without losing the saved values.
LinuxCNC G92.3 Restore G92 OffsetsG92.3G92.3 is a LinuxCNC G-code that restores the G92 coordinate system offset to the values saved in parameters 5211 through 5219. It lets a program reuse G92 offsets that were set by an earlier program.
LinuxCNC G93G93G93 selects inverse time feed rate mode in LinuxCNC. In this mode an F word sets the duration of a move: the move is completed in one divided by the F number minutes, so F2.0 finishes the move in half a minute. It does not affect G0 rapid moves; G94 (units per minute) and G95 (units per revolution) are the other feed rate modes.
LinuxCNC G95G95G95 is the units-per-revolution feed rate mode in LinuxCNC. In this mode an F word sets the controlled point movement per spindle revolution, using the active length units. A new feed rate must be specified after switching to this mode.
LinuxCNC G97 RPM ModeG97G97 is a LinuxCNC G-code that selects spindle RPM mode. The S word gives the spindle speed, and the optional $ word selects which spindle is controlled. It is part of the G96/G97 spindle control mode pair.