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Re: HART Multi-drop network

Message posted by Romilly ( : 80.229.220.91) on 11 July 2013 at 10:57:04.

in reply to: HART Multi-drop network posted by Zaheer on 04 July 2013 at 07:29:52.

Presumably you have correctly allocated different non-zero polling addresses to each HART device before connecting them in multidrop.

Are all the HART devices set to park their loop current? Are any of the devices HART rev. 6 or 7? Or the gateway? (Rev. 6 introduced a change to command 6 used to set the polling address and current mode, but all devices should retain compatibility.)

I am thinking maybe you run out of power to the extra field devices; have you measured the total loop current and supply voltage?

What is the make and model of the HART/Ethernet gateway? And of the field devices?

What is the total length of cable on the multidrop network?




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