Cover image of How to use G-Code UI on ctrlX CORE

How to use G-Code UI on ctrlX CORE


This documentation describes how to install and use ctrlX G-Code UI. G-Code UI was developed with Node-RED and PLC Engineering. It consists of a PLC project package and Node-RED template which can be customized.

G-Code UI functionality

G-Code UI supports the following features:

  • Editor to create / write / delete a NC program
  • NC program selection
  • Start, stop, reset, and pause the NC program kinematics, respectively.
  • Control path velocity by feedrate override
  • Different coordinate systems like ACS and PCS
  • Observe position and state of kinematics.
  • System diagnostics
Installation and activation of G-Code UI

A licensed installation of following apps (V2.4.x or V2.6.x) is expected before activating G-Code UI.


Note: Please install G-Code Runtime App after MOTION App!


The G-Code UI template includes two parts:

  • PLC package: Bosch Rexroth AG GCode ****.package
  • Node-RED template flows: GCode_UI_****.json (or GCode_UI_*.*.*.*.zip)

Both should be installed to activate and operate the UI. 

PLC Part

Install the G-Code template package to the ctrlX PLC Engineering, only need to install for the first time:

How to install PLC template package of G-Code UIHow to install PLC template package of G-Code UICreate a new PLC project and insert PLC templates. Both the G-Code template and Motion Interface template need to be inserted:

Insert the PLC templates in PLC projectInsert the PLC templates in PLC project

Select and insert G-Code templateSelect and insert G-Code templateSelect and insert Motion Interface templateSelect and insert Motion Interface template
Make sure the right PLC project is loaded, and "Application" of PLC runtime in ctrlX WORKS is in state of "RUN".     
Application of PLC runtime in ctrlX WORKS is in state of RUNApplication of PLC runtime in ctrlX WORKS is in state of RUN
All of PLC interface variables can be traced in the DataLayer node, as shown in the figure below.
(Path: plc/app/Application/sym/GVL_UI_PLC/stInputData)PLC interface variables in the DataLayer nodePLC interface variables in the DataLayer node

Node-RED part
There are two methods to load and active Node-RED configuration:

  • Load GCode_UI_****.zip from the "Manage app data".
  • Or import GCode_UI_****. json in Node-RED flow editor.


GCode_UI_**** .zip : It doesn't only contain the configuration of Node-RED, but also the configuration of Motion, the existing motion configuration will be overwritten. Therefore, it is recommended to load and activate the Node-RED configuration through the second way.
GCode_UI_****. json:  It only contains the configuration of Node-RED, the user needs to add axes and create at least one kinematics before implementation.
Method 1: Activate the configuration of Node-RED by loading the GCode_UI_****.zip file.
  • Switch ctrlX CORE state to "Setup" mode, uploads GCode_UI_****.zip file via "Home → Manage app data → Archive/Uploads Configuration".
  • Active the configuration and switch the ctrlX CORE state to "Operating" mode.
Activate the configuration of Node-RED by loading the GCode_UI_****.zip fileActivate the configuration of Node-RED by loading the GCode_UI_****.zip file
Method 2: Activate the configuration of Node-RED by import the GCode_UI_****. json file.                 
Open Flow Editor of Node-RED App, then import the Node-RED configuration flows.

Activate the configuration of Node-RED by import the GCode_UI_****. json fileActivate the configuration of Node-RED by import the GCode_UI_****. json file
The Node-RED configuration has been uploaded, but there are two ctrlX Automation nodes that need to be logged in before flows are deployed. One is the “Data Layer Request” node and another one is “Data Layer Subscribe" node. 
“Data Layer Request”  node“Data Layer Request”  node“Data Layer Subscribe" node“Data Layer Subscribe" node

How to log in “Data Layer Request” node
  • Double-click any “Data Layer Request” node to open the configuration window.
  • Enter the user name and password to log in, as shown in the figure below.
  • Deploy the flows.
Same for the "Data Layer Subscription" node.
How to log in Data Layer request nodeHow to log in Data Layer request node
Description of  G-Code UI

G-Code UI have two mode: HMI-Configuration and HMI-Operating.  

HMI-Configuration of G-Code UIHMI-Configuration of G-Code UI

HMI-Configuration is shown as picture. Before you switch from UI to operating mode, it is needed to refresh and select the right kinematics. The table 1 describes the areas in configuration mode: 

Table 1: optional operations of HMI-Configuration
  Name Description
1 Select option Select kinematics to be activated from the "Select option" drop-down menu.
2 REFRESH Load all of kinematics which have been created in motion kernel. 
3 OPERATING Switch HMI mode from configuration to operating.
4 Selected kin Displays the loaded kinematics.

HMI-Operating of UI includes four areas: program, machine status, operation and diagnosis.

HMI-Operating of G-Code UIHMI-Operating of G-Code UI

Program area:

There are two pages in the program area. The default page "NC_Program" displays the operable fields for of the program, which are described in the table 2. The "Active_NC_Blocks" page displays the activated NC block. The page is switched from "NC_Program" to "Active_NC_Blocks" automatically, when the NC program is running.
Table 2: optional operations of program area of HMI-Operating
  Name Description
1 File List Show the list of NC programs. The default storage path is "Manage app data/Active/scripts/gcode".
2 Filename to be created Input the name of new NC program.
3 REFRESH Refresh the NC program list.
4 CREATE After input the new program name via "Filename to be created", click "CREATE" to create program.
5 DELETE Delete program.
6 ACTIVE BLOCKS Switch page to "ACTIVE BLOCKS" manually. Only when NC program is running, the  "ACTIVE_NC_ BLOCKS" page can display the executing NC blocks. Switch from "Active_NC_Blocks" page to "NC_Program" page via "PROGRAM" button.
7 SAVE Save the NC program.

Machine status area
  • Display axis status, position, and velocity information. Maximal four axes status can be displayed.
  • Slider of override to modify the percentage of command value F.
  • Observe the active command options.
  • Show kinematics activated name and state.
  • Displays pre-selected and loaded programs.

Operating area:

This area provides operation buttons to control the system.
Table 3: optional operations of operating area of HMI-Operating
  Name Description
1 CONFIGURATING Switch HMI from operating to configurating.
2 KIN ON Axes power on and group enable. 
3 KIN OFF Axes power off and group disable.
4 PROG LOAD Load the pre-selected program, switch UI state from "DISABLED" to "READY".
  • Start NC program, switch UI state from "READY" to "RUNNING".
  • Continue running NC program which has been interrupted by pause. UI state switch from "PAUSE" to "RUNNING".
  • Reset M0 and continue running NC program. 
6 STOP Stop NC program, switch UI state from "RUNNING" /"PAUSE" to "READY".
7 PAUSE Pause NC program, switch UI state from "RUNNING" to "PAUSE".
8 RESET Reset errors, switch UI state from "ERROR" to "DISABLED".
9 PCS Show kinematics position in product coordinate system.
10 ACS Show kinematics position in axis coordinate system.

Diagnosis display

When an error occurs, the user can get the following information from the UI:

  • Main diagnosis: Main number of the diagnostic information.
  • Detail diagnosis: Detailled number of the diagnostic information.
  • Error Information: Description of error.
  • Error source: Traced source of the error

The diagnosis includes motion error, G-Code error, PLC error and error from others.  If the error cannot reset from UI, users can clear pending alarm as below picture. 

Clear pending alarmsClear pending alarms

All errors also can be traced in Diagnostics/Logbook, and in addition, the errors from G-Code and motion can also be traced in data layer node.

G-Code error:  script/instances/<"kinematics name">/diag

The DataLayer node for G-Code errorThe DataLayer node for G-Code error

 Motion error: motion/kin/Kinematics_1/state/diag-info

The DataLayer node for Motion errorsThe DataLayer node for Motion errors


Big NC file can be loaded in "Manage app data -> Active -> Scripts will be executed by script runner", it should be edited before loading.
Operate G-Code UI 

Before you operate G-Code UI, at least one kinematics should be created and PLC project should be in “RUN” state.

  • Open G-Code UI at the Node-RED/ Dashboard. 
  • Refresh and select which kinematics will be activated at configurating mode.
  • Click "OPERATING" button to switch HMI mode from configurating to operating.
  • Axes power on and group axes of kinematics via "KINON" button.
  • Input the new program name via "Filename to be created", then click the button of "CREATE" to create a new program. When create a NC program, system will automatically create the “gcode” folder, which is located in "Manage app data -> Active -> Scripts will be executed by script runner" as the default NC program storage location.
  • Select and open the new program, then NC program can be edited.
  • Save the NC program via "SAVE" button.
  • Click the "PROG LOAD" button to load the pre-selected program.
  • Click the "START" button to implement the program which loaded.
  • Pause NC program via "PAUSE", and then continue running program via "START". 
  • Stop NC program via "STOP" and reset error via "RESET".

Related Links
Established Member

Loaded and runs fine. However i found a few errors that showed up when following the steps.

when downloading the PLC program there was an error, apparently there was a task not in used. so i deleted that task. I think it was related to the oscilloscope.

Node Red 2.4 : subscription nodes gives a constant error disconnecting the node. Installed Nodered 2.2 and works well. 


Hi @Usalas

Thank you for you feedback.

Below picture is shown a workaround for the error of subscription nodes for Node Red 2.4

Users can manually enter recommended values.

Node-RED error solution for error solution for



Is there a way to pass PLC tags to X, Y, Z positions? Like in this example of G01 X50 Y50 Z-10 , I could use something like this: G01 X%PLC_Tag_X% Y50 Z-10 where X position is defined by PLC_Tag_X. This would be very important if some of the X Y Z points need to be calculated based on parameters entered by the user.


Hello. In actual version we don't support positioning of NC axes by commanding the position value via a variable. But the NC functionality is gradually being expanded. This feature is planned for the future.

Established Member

Good Morning,

Is it possible to have a download link for the version of the PLC package file for version 1.20?, am I only finding versions 2.4 and 2.6


Hello JordiLaboria

the G-Code Runtime APP is being continuously developed. The package is currently available for version ctrlX WORKS 2.6. We strongly recommend to use the latest version, as the functionality of the older versions is insufficient for real applications.

Best regards, Eduard

Established Member

Ok. Thank you very much for the reply.

Best Regards



Established Member

Good morning, I suppose you already know but there is an error in one of the internal structures, MC_AXIS_PLC_OPEN_STATE, whose data must be modified by hand in the program.



Best Regards





Hello JordiLaboria

Thanks for your information.

This issue had modify in the version 2.6 of the PLC package (with the default CXA_PLCopen or higher).

lib version lower CXA_PLCopen DISABLEED


lib version is CXA_PLCopen or higher: DISABLED


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