I have an Siemens PLC and TP900 HMI.
at The Moment the Hmi is showing every Data values as ######.
I have Tried pinging the PLC and HMI and they are on the same Network I can Download and Go Online with the PLC and HMI both.
Under Connections Setting I have kept this setting.

Hello,

Please have a look at the following link:

No connection to PLC after WinCC Panel Images V17 Update 6

Please check the Date and time on your Panel. 

Best regards,

Wizard

Hi,

If you are using WinCC Panel Images V17 Update 6 or higher on the Comfort Panel, please see this FAQ:

No connection to PLC after WinCC Panel Images V17 Update 6

Also make sure that the date and time match on PLC and HMI devices.