Newbie help getting KTP400 talking

Hi,

I'm new to the world of Siemens and 'off the shelf' PLC's having developed my own previously.

Right, I have a S7-1214 AC/DC/RLY V4 and a KTP400 basic colour PN.

I can get the PLC to talk to the PC,

I can get the PLC to see the HMI

But I can't get the PC to talk to the HMI

I have a CSM1277 switch which has the PLC and HMI connected to it and the PC.

HELP PLEASE!!!!

thanks,

Jon