Floboss Stop Updating the value after sometimes Floboss 503

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Thread Starter

sginandjar

Dear Members,

We have a scada system with below architecture:

Wonderware-->DASMBTCP-->Lantronix--->Floboss 503.

we manage to established the communication with Floboss using DASMBTCP but the communication stop after few minutes. the floboss value stop updated on HMI side. we found that the floboss is not responding. the RS485 RxD indicator keep turning ON.

so far the solution is to restart the Floboss device with TxD indicator ON.

thanks
sginandjar
 
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Lynn August Linse

Make sure you don't have a grounding problem between the Lantronix and Flowboss.

Not correctly handling the RS-485 ground wire is a common cause of RS-485 systems which work for some period, then stop - due to a ground potential having built up on floating circuitry.

If you have the Lantronix XPress-DR, it has a floating ground on the serial port, so you WILL need to include a ground wire on the RS-485 link. Such isolated products rarely work will with a true 2-wire RS-485 lacking a ground wire.
 
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