Hi
A word of caution. You mention a TI530 in your original title, and then go on to mention the 505-series in the body.
There is no TI530 DP interface that I know of - how do you intend to attach the PLC to the Profibus network?
Some of the 505-series CPUs do have DP interfaces but in these the PLC will only operate in DP-master mode. Many HMI devices also expect to act as master so they are controlling the exchange of data when they need to. You can't have two masters speaking to each other on the same network, so something's gotta give. Will the HMI operate in slave mode, and how does the PLC know what data to send it?
You could link them as masters using something like a Siemens DP-DP Coupler but I suspect there are other questions still to be asked and answered.
I've had a quick scan around the Beijer web-site but I only see serial drivers for the 530/505 PLCs, not Profibus. Problems, problems, problems!
Regards
Ken