Vision and Samba Touch Screen problem troubleshooting

When the touch screen is not working properly, please check the following:

1.  Make sure that the screen is clear and  that there is no foreign object between the plastic cover and the HMI itself that might apply pressure on the screen.
2. Try to remove the original protective cover.
3. If the PLC is installed in a cabinet, please remove it from the cabinet and test functionality.
4. The plastic clips that press the PLC to the cabinet, might be over tightened and might apply pressure to the screen that will be interpreted by the screen as a touch.
5. Monitor SB16 via online in VisiLogic, SB16 will rise when the HMI is touched. ( Make sure that the value of SB16=0 when screen is not being touched)
6. Monitor SI40 and SI41 (X and Y coordinates of the screen when (0,0) is the upper left corner of the screen). The value of SI40 and SI41 should be `-1` when there is no touch.

7. Calibrate the couch screen via Info Mode:

• Press on the HMI for 4-6 seconds till Info Mode will load.
• The default password is `1111`.
• Press on the "Calibrate Screen" button.
• Touch the middle of the squares.