When I was as Plantweb Eng. I installed a couple of AMS DM with Comtrol, now I received a call from another FSO about an architecture they are trying to install with an AMS v12.0
They have the transmitters connected to an MTL4841 and the output of this MUX is connected to a NPort 6450 from MOXA, and then connected to DeltaV, but they have a lot of communication problems with AMS DM, is this a valid architecture?
As far as I know the MOXA converter is not approved for the AMS DM, could this be the cause of the communication failures?
You may want to check to see if the HART transmitter connected to the MTL4841 is a HART 5 version protocol. If it is, there is a release note from AMS that
"MTL 4841/4842 AND 8000 MULTIPLEXERS:- Support only HART Rev. 5, and therefore do not recognize some device types supported by AMS Device Manager."
What model is the MOXA PERIPHERALS?
In reply to Tinh Phan:
Are you able to tell if the communication problem is between AMS-DM and the HART MUX (affecting all devices equally/simultaneously) or is it between the HART MUX and the HART devices (only affecting some devices)? What error messages are you seeing in the software? Could you share a screen capture?
HART7 devices would be an issue as Thin noted – usually HART7 devices on a HART5 system appear with “generic” access, but it could be a particular MUX does not let the communication pass at all
Troubleshoot from the ground up, starting with power, then communication, and lastly system integration
I suppose you have already checked the basics:
They have the transmitters connected to an MTL4841 and the output of this MUX is connected to a NPort 6450 from MOXA, and then connected to DeltaV, but they have a lot of communication problems
with AMS DM, is this a valid architecture?
John H. Carter Co., Inc.
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