1734 ADN point i/0 adaptor - PLCS.net

jcperdue · March 4th, 2013, 03:01 PM

I have installed the 1734 ADN point I/O Adaptor. My system power Let is off, but I measure 24V with my Fluke? Shouldn't I at least be getting the green Led?

Ken Roach · March 4th, 2013, 03:28 PM

Are you measuring at the DeviceNet connector, or at the removable terminal block ?

I think the System Power LED indicates the presence of power at the removable terminal block plus an active DC/DC converter to supply the Adapter's logic and the 5V PointBus supply.

The Field Power LED is upstream of the DC/DC converter and shows the presence of 24V bulk power at the removable terminal block, which is then connected to the local POINT power bus.

DeviceNet power is totally separate and isolated from the Field Power and System Power, and should come from a different power supply.

jcperdue · March 4th, 2013, 05:02 PM

Thanks, I don't know why I thought the Devicenet cable would power it.

March 4th, 2013, 03:01 PM	#1
jcperdue Member Join Date: Feb 2013 Location: Indianapolis, IN Posts: 13	1734 ADN point i/0 adaptor I have installed the 1734 ADN point I/O Adaptor. My system power Let is off, but I measure 24V with my Fluke? Shouldn't I at least be getting the green Led?

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March 4th, 2013, 03:28 PM	#2
Ken Roach Lifetime Supporting Member + Moderator Join Date: Apr 2002 Location: Seattle, WA Posts: 15,757	Are you measuring at the DeviceNet connector, or at the removable terminal block ? I think the System Power LED indicates the presence of power at the removable terminal block plus an active DC/DC converter to supply the Adapter's logic and the 5V PointBus supply. The Field Power LED is upstream of the DC/DC converter and shows the presence of 24V bulk power at the removable terminal block, which is then connected to the local POINT power bus. DeviceNet power is totally separate and isolated from the Field Power and System Power, and should come from a different power supply.

March 4th, 2013, 05:02 PM	#3
jcperdue Member Join Date: Feb 2013 Location: Indianapolis, IN Posts: 13	Thanks, I don't know why I thought the Devicenet cable would power it.

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