Test the Human Machine Interface (HMI)
This equipment operates at high voltages. Use extreme caution, observe all warnings,
and follow all safety procedures. Failure to observe safety precautions may result in
injury or death to personnel.
1. Ensure power is supplied to the PLC.
2. Ensure the DIP switches (Figure 27, Item 53) are set on the DP/MPI setting.
3. If the HMI is unresponsive, or displays a "Cannot write to PLC" error, check all wiring connections. If
wiring connections are satisfactory, replace the HMI (Figure 27, Item 54).
4. If there is no display, test the 24 VDC power supply IAW procedures given in this WP. If the 24 VDC
power supply is operating correctly, replace the HMI.
Figure 27. Test the Human Machine Interface (HMI).
END OF WORK PACKAGE