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MyCNC software supports Global Variables Array. Values of this array represent current state and configuration of CNC control. There is access to this Array from MyCNC software,  GUI components, G-code program, PLC procedures, 3rd party software through Server API etc. Values of this array can be used for inter-process communication as well. List of variables and short description shown below.

 
Number Variable Name Description, Comment
0001...
5000
G-Code user parameters  Variables can be used in G-codes for Parameterized programming
5021 ... 5029 Current Machine Position Current Machine coordinates for axes X,Y,Z,A,B,C,U,V,W
5041 ... 5049 Current Program Position Current Program coordinates (in current coordinates system) for axes X,Y,Z,A,B,C,U,V,W
5070...
5078
Result of probing G38.2 - G38.5 If Probing commands G38.2-G38.5 finished, result of probing latched in this registers for every axes X, Y, Z, A, B, C
5161 ... 5169 G28/G28.1 Home Position

Command G28.1 stores Current Machine position to this registers. Command G28 moves tool to "Home/G28" position (which is actually restored from this registers).

5181 ... 5189 G30/G30.1 Home Position The same as Registers 5161...5169, but used for G30/G30.1 commands

Command G30.1 stores Current Machine position to this registers. Command G30 moves tool to "Home/G30" position (which is actually restored from this registers).
5211 ... 5219 G92 Offset  
5220 Current coordinate system number MyCNC control softwrae supports 9 Work Coordinate systems (G54, G55, G56, G57, G58, G59, G59.1, G59.2, G59.3). Register contains Current Work Coordinates system number.
5221 ... 5229 Offset for Coordinate System 1 (for G54) Registers keep offset between Machine Coordnates and Work Coordinates for Coordinate System #1
5241 ... 5249 Offset for Coordinate System 2 (for G55) Registers keep offset between Machine Coordnates and Work Coordinates for Coordinate System #2
5261 ... 5269  Offset for Coordinate System 3 (for G56)  Registers keep offset between Machine Coordnates and Work Coordinates for Coordinate System #3
5281 ... 5289  Offset for Coordinate System 4 (for G57)  Registers keep offset between Machine Coordnates and Work Coordinates for Coordinate System #4
5301 ... 5309  Offset for Coordinate System 5 (for G58)  Registers keep offset between Machine Coordnates and Work Coordinates for Coordinate System #5
5321 ... 5329  Offset for Coordinate System 6 (for G59) Registers keep offset between Machine Coordnates and Work Coordinates for Coordinate System #6
5341 ... 5349  Offset for Coordinate System 7 (for G59.1) Registers keep offset between Machine Coordnates and Work Coordinates for Coordinate System #7
5361 ... 5369  Offset for Coordinate System 8 (for G59.2) Registers keep offset between Machine Coordnates and Work Coordinates for Coordinate System #8
5381 ... 5389  Offset for Coordinate System 9 (for G59.3)  Registers keep offset between Machine Coordnates and Work Coordinates for Coordinate System #9
5400 Current Tool Number Register keeps Current Tool Number
5401 ... 5408 Current Tool Offset Registers keep Tool Offsets for axes X, Y, Z, A, B, C for Current Tool
5409 Scheduled (Next) Tool Number Register keeps Scheduled (Next) Tool Number. Tool change procedure M6 uses Registers #5400, #5409 to know where to put old Tool and where from take New one.
5410 Current Tool Diameter  
5411 Tool Front Angle Reserved
5412 Tool Back Angle Reserved
5413 Tool Orientation Reserved
5415 Tool Holder Orientation Reserved, Can be used in Toolchange macro
5421 ... 5429 Working Cube/Working Area/Soft Limits - Minimum Point CNC software controls current Tool position and can prevent movement outside of Working Area (Soft Limits Control). THis registes keep Maximum and Minimum Working Area coordinates (Machine). Macros may use this registers to send Tool to Work Limits position (for exmple move to Up Limit)
5431 ... 5439  Working Cube/Working Area/Soft Limits -Maximum Point see above 5421...5429
5441 ... 5449 Position Register 1 (for G28.2 save / G28.5 move-to) The same as Registers 5161...5169, but used for G28.5/G28.2 commands

Command G28.2 stores Current Machine position to this registers (Home2).
Command G28.5 moves tool to Home1 position (which is actually restored from this registers).
5451 ... 5459 Home After Position Register At the end of Homing procedure Current Machine Position is assigned to this registers values.
5460 Current number of G-codes line This register represents Line Number of Currently running G-code file
5461 ... 5469 Current G-code Work Position If G-code running was stopped, this registers keep Position at which it was happened.
5471 ... 5479 Tool Sensor Position Registers keep Tool Length sensor Position and used in Tool Length Measure macro for Tool positioning toward the sensor. Can be used for Automatical and manual Tool change.
5490 Surface Sensor Width value Register keeps Surface Sensor Width (Thickness). This value used for sendor thisckness correction while Surface measure procedure.
5494 Surface Sensor Number  
5495 Surface Sensor Type Type of Surface Sensor:
"0" - Normally opened,
"1" - Noramlly closed
5496 Sheet Thickness The Value used for custom Surface Measure macro procedure.
5501 ... 5509 Position Register 2 (for G28.3 save / G28.6 move-to) The same as Registers 5161...5169, but used for G28.6/G28.3 commands

Command G28.3 stores Current Machine position to this registers (Home2).
Command G28.6 moves tool to Home2 position (which is actually restored from this registers).
5511 ... 5519 Position Register 3 (for G28.4 save / G28.7 move-to) The same as Registers 5161...5169, but used for G28.7/G28.4 commands

Command G28.2 stores Current Machine position to this registers (Home2).
Command G28.5 moves tool to Home3 position (which is actually restored from this registers).
5521 End sensor ignoring Writing "1" to this register turn off Hardware End Limits control. It's used for Homing procedures, if Limit and Home sensor can be actually the same sensor and "Stop Running" while "Limit Sensor" activated should be temporarily disabled.
5522 Jog step value There are 2 jog modes - "continuos jog" and "step jog". THis register contains Step Value for step jog (or 88.88 for continuous jog mode)
5524 Spindle speed  
5525 Soft limits ignore (writting "1" to this register turn off Soft limits control. used for homing procedure) Writing "1" to this register turn off Soft Limits control. It's used for Homing procedures to temporarily disable Soft Limits control.
5526 M30 scheduled Writing "1" to this register will cause reset NC program current pointer after running stopped/paused.
Register used for M30 implementation.
5528 Draw Mode Used for Cutting Tables (Plasma, Oxyfulel, Laser, Waterjet).
If "1" written in this register, Cutting ON/OFF functions (M03, M20, M71) are ignored. This mode is used when need to test g-code motion without actual cutting.
5529 Shock Sensor Ignore Writing "1" to this register will put "Showck Sensor" state to ignore.
5530...
5538
Pulse Per Unit Registers store Current "Pulse per unit" values for each axis X, Y, Z, A, B, C
5541 ... 5548 Parking point #1 Position

CNC control has macros for
Store Cuurrent Machine position as "Parking" position and
Goto Parking Position.
Up to 10 Parking Positions reserved in Global Variables Array.

This registers are for Parking Position #1

5551 ... 5558  Parking point #2 Position See 5541...5548
5561 ... 5568  Parking point #3 Position See 5541...5548
5571 ... 5578  Parking point #4 Position See 5541...5548
5581 ... 5588  Parking point #5 Position See 5541...5548
5591 ... 5598  Parking point #6 Position See 5541...5548
5600 Current toolchanger type Register keeps Toolchanger Type. Through this register Automatic Toolchange (ATC) procedure can be disabled ("ignore" state) for test purpose.
Used for M6Txx macros
(0-manual, 1-linear, 2-rotary); used for M6 Txx macro procedures
5601 ... 5609 Toolchanger Unload Offset value Distance between Tool Holder and Tool Release Position (No risk to hit ATC mechanism while move out to toolpath)
5610...
5607
Toolchanger blow-off offset Reserved for customized ATC prcedure.
5701 Current Technology Register represents Current Technology process on the machine. It's used for some M-codes to identify current process.
0- flexible
1- plasma
2- oxyfuel (gas)
3- mill/router
4- lathe
5- laser engraving
6- laser cutting
7- waterjet
5702 THC Enabled Register represents state of Torch Height Control (THC) in the system
0- THC disabled
1- THC Enabled
5703 IHC Enabled Register represents state of Initial Height Control (IHC) in the system
0- IHC disabled
1- IHC Enabled
5710 CV Mode 0- CV Mode disabled
1- CV Mode enabled
5711 CV Mode Tolerance Register keeps CV Mode Tolerance value
5714 Soft Limits Checker CNC control software may check entire g-code for toolpath  goes outside of Working Area. For Big g-code files this process can take machine time and RAM. Soft Llimits Checker can be disabled through this register.
0- Soft Limits Checker disabled
1- Soft Limits Checker enabled
5715 Lathe Gear Parameter represents state of Lathe Gears
5720 Single Block Mode 0- Single Block Mode disabled
1- Single Block Mode enabled
6060 Command Code of Motion Control

Parameter represent Command Code currently running by Motion Control.
3- Wait State
5- Motion Control Error
18- Linear Interpolation (G1)
19- Arc Interpolation (G2,G3)
22- Thread cutting
23- Tapping
28- Positioning command (G0)

6064 Total lines in G-code file  
6071 X Homing Finished Value is 
set to "1" CNC control software started and
reset to "0" in X-axis macro procedure.
Parameter can be used to display if Homing procedure finished to axis or block starting g-code without Homing.
6072 Y Homing Finished see #6071
6073 Z Homing Finished see #6071
6074 A Homing Finished see #6071
6075 B Homing Finished see #6071
6076 C Homing Finished see #6071
6080 Mileage counter Register reserved for Oil Pump control.
6081 Reverse counter Register reserved for Oil Pump control.
6101 ... 6108 Current Tool Holder Position Reserved for custom ATC procedure. Registers used to store position of Current Tool Holder (to Put previous Tool)
6111 ... 6118 Next Tool Holder Reserved for custom ATC procedure. Registers used to store position of Next Tool Holder (where Next Tool should be taken)
6121 ... 6128 Tool Holder #1 Position Position of Tool Holder #1. Used mostly for Linear-Style Toochange Procedure
6131 ... 6138 Tool Holder #2 Position Position of Tool Holder #2. Used mostly for Linear-Style Toochange Procedure
6141 ... 6148 Tool Holder #3 Position Position of Tool Holder #3. Used mostly for Linear-Style Toochange Procedure
6151 ... 6158 Tool Holder #4 Position Position of Tool Holder #4. Used mostly for Linear-Style Toochange Procedure
6161 ... 6168 Tool Holder #5 Position Position of Tool Holder #5. Used mostly for Linear-Style Toochange Procedure
6171 ... 6178 Tool Holder #6 Position Position of Tool Holder #6. Used mostly for Linear-Style Toochange Procedure
6181 ... 6188 Tool Holder #7 Position Position of Tool Holder #7. Used mostly for Linear-Style Toochange Procedure
6191 ... 6198 Tool Holder #8 Position Position of Tool Holder #8. Used mostly for Linear-Style Toochange Procedure
6201 ... 6208 Tool Holder #9 Position Position of Tool Holder #9. Used mostly for Linear-Style Toochange Procedure
6211 ... 6218 Tool Holder #10 Position Position of Tool Holder #10. Used mostly for Linear-Style Toochange Procedure
6221 ... 6228 Tool Holder #11 Position Position of Tool Holder #11. Used mostly for Linear-Style Toochange Procedure
6231 ... 6238 Tool Holder #12 Position Position of Tool Holder #12. Used mostly for Linear-Style Toochange Procedure
6241 ... 6248 Tool Holder #13 Position Position of Tool Holder #13. Used mostly for Linear-Style Toochange Procedure
6251 ... 6258 Tool Holder #14 Position Position of Tool Holder #14. Used mostly for Linear-Style Toochange Procedure
6261 ... 6268 Tool Holder #15 Position Position of Tool Holder #15. Used mostly for Linear-Style Toochange Procedure
6271 ... 6278 Tool Holder #16 Position Position of Tool Holder #16. Used mostly for Linear-Style Toochange Procedure
6280 ... 7000 Reserved for big toolchanger  
7005 Tangent Knife Control 0- Tangent Knife Control disabled
1- Tangent Knife Control enabled
7006 Hardware PLC Move Flag Reserved for Hardware PLC Interprocesses communication
7009 THC Speed Reserved for Torch Height Control(THC);
THC Control Speed mapped to rhis register
7010 THC Arc Voltage THC Measured Arc Voltage mapped to this register
7011 THC Arc Voltage Reference THC Reference Voltage mapped to this register
7020 Safe Height Register keep Safe Height Value.
Macros can use this value to move Tool to safe height. Variable can be used in GUI configuration to display/edit the value.
7030...
7037
Feed Speed Registers represent Feed (Cutting, G1,G2,G3 Interpolation) Speed Settings for each axis
7040...
7047
Rapid Speed Registers represent Rapid (Positioning, G0) Speed Settings for each axis
7050...
7057
Jog Speed Registers represent Jog Speed Settings for each axis
7060...
7067
Marking Speed Registers reserved for Marking Speed Settings for each axis
7070 Jog Continuous mode Register represents Jog Mode setup
0- jog continuous mode
1- jog step mode
7071 Disable Jog from Keyboard 0- Jog events from keyboard (joystick, input pins, Server API) enabled
1- Jog events disabled
7072 Feed Overspeed value Register represents Overspeed value
7073 Spindle Overspeed value Register represents Spindle Overspeed value
7075 Edge Probe Sensor Diameter Diameter value of Edge Probe sensor
7076 X Offset for Edge Probe sensor X Offset value for Edge Probe sensor
7077 Y Offset value for Edge Probe sensor Y Offset value for Edge Probe sensor
7079 G0/Positioning Overspeed  
7080 (PLC) Set Move Speed Reserved for PLC
7081 (PLC) Set Move Acceleration  Reserved for PLC
7082 (PLC) Reset Coordinates Reserved for PLC
7090 Camera Ready  
7100 (Multidev) Devices Mask  
7101...
7132
(Multidev) Device #1... Device#32 Enable