Hello,

For some time I am trying to put back in function a Weiler 24UD CNC. It has a Sinumerik 820T controller. The issue that I am facing right now is the fact that I can't switch the machine in Jog mode or Reference mode.

I have checked PLC program and the digital inputs from rotary switch (operation mode selection). This digital inputs are used only to activate the Automatic and MDI Automatic operating mode. Also, inside of the PLC program, the digital inputs from the X+, X-, Z+, Z- switch are not used.

Can somebody guide me with what should I do next in order to jog the axis? is there another way to activate Jog, Inc feed or Reference point operating modes?

Thank you in advance!

Hello nulizhang,

   First of all thank you for the information.    

As far as I know it's an OEM Weiler 24UD CNC. It's controlled by a Siemens Sinumerik 820T system.

   In the machine documentation, it is explained pretty clear that after each machine power on, the operator must make the axis reference. After the operator select the ref. point operating mode, in the documentation is a screen picture with how the screen should look like when the machine is in that op. mode. In my case this is not possible, because like I wrote in my previous post, the digital inputs from the rotary switch are activating only the MDI Auto and Automatic mode (inside of the PLC program). I have also the printed version of the PLC program and it's the same: the digital inputs from the rotary switch are activating only the MDI and Auto operating mode.

I've read that Sinumerik 810T has an internal operating mode selection and the rotary switch is the external operating mode selection, but in my case, at 820T on the front panel, I was not able to find that specific button.   

Like I wrote in my previous post, the digital inputs from the axis switch, X+, X-, Z+, Z-, they are also not used inside of the PLC program. 

   I can modify the PLC program in order to create the specified outputs, that you suggested , but my question is how it worked until now? This thing I don't understand. 

Hello,

   Thanks again for your support! I have already checked the digital inputs from the operation mode rotary switch, I0.0, I0.1, I0.2, I0.3, and the ones from the axis joystick switch, I1.6, I1.7, I2.6, I2.7 and they are ok( PLC status->input byte).

    My problem is that the axis direction inputs are not used inside of the PLC program. Also, inside of the PLC program it's available only the MDI and Auto operation modes. So, I don't know how the operator used to make the axis reference, in reference mode, and also how he used to move the axis in jog mode.

   "put back in function this machine": the previous owner claims that the machine used to work in the past. For the last 3-4 years the machine was not used and since some time now I am trying to put it back in function.

   "Internal operation mode selection": I found a documentation of Sinumerik 810M controller, I was not able to find something like that for Sinumerik 820T. In that documentation it is explained that there are 2 ways how you can activate one of the operating modes:

* selection of operating modes with internal machine control panel (please check pag.55 from the attached pdf file);

* selection of operating modes with external machine control panel (please check pag.58 from the attached pdf file )

   I didn't know about PLC MD2002, I will check bit number 3. and I will give you a short feedback.

Thanks again!