I have been installing AMS Device Manager at a customer site using Hart over Profibus (T+H xEPI modules) interfacing with Delta V and Stahl remote I/O. I have successfully managed to establish comms with the Hart devices and I am able to work with them online. In fact it works very well. My problem is that establishing comms is inconsistent. It take me about 1 in 10 attempts to make the connection whenever I rebuild Hierarchy on the device manager server plus station. I obviously cannot accept this as a satisfactory install and was therefore wondering whether anyone else has come across such an issue. The versions I am using for all hardware and software should be compatible i.e. Delta V 10.3.1 Device Manager V12.0. In the Set Bus Parameters of the T+H software I am using the dafault PB settings. When using a bench test setup of the system I didn't have this problem. Any thoughts/advice would be appreciated.
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I have installed many Hart over Profibus gateway nodes across different manufacturing sites within my company. I agree that the interface is very robust once you get it up and running. It is also sometimes challenging to establish the communications for the first time. I have found the following items to consider can be helpful.
The DeltaV Profibus card needs to have a firmware version > 1.37 (testing my memory)
There was a new verson of TACC software issued for AMS version 12.0. TACC 126.96.36.199.
There was also another TACC upgrade for version 12.5. TACC 188.8.131.52.
I have the best luck with droping the Profibus segment baud rate from 1.5 MBit/sec to 500 Kbit/sec.
In most instances, I have also used the default DP settings. In some cases it helped to set the Profile to user defined and increase the Ttr.
Test with 70,000, 80,000 or 100,000.
I have found that the following procedure works most of the time to establish communications.
1. Pull and reset DeltaV Profibus IO card (pull out of IO rack for about 15 seconds, can be challenging depening on state of process)
2. Reset T+H gateway (Make a programming change to each unit that requires a reset, or cycle power)
3. Rerun Set Bus Parameter program (I removed the existing device and use the search function to add the new hardware. Then I configured and activated it)
4. Rebuild Hierarchy in AMS Device Manager
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