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Hi Can you tell us type of modbus that you have... Rtu.. Tcp...

Okay got it So have a read on the hereafter document it can help you ! it is talking of the third byte of IOA which is used to determine unambiguous addresses within specific system....

Okay so what is the meaning of " ASDU with invalid CA/COT/IOA arrives " the term invalid is not clear and can be misinterpreted... Do you mean a "wrong value " for example on a voltage value...

Check these notes from a good doc ...: I guess it really depend on the SQ (STRUCTURE QUALIFIER ) and mapping for sure

Here is some notes from a manual that i got : Will have a search on that question...

Can you tell us : Frame type Controls systems Combustion mode "Open" "Simple"/combined cycle A bried description of the problem would be better way for us to have a picture of whats goig on a your site

COT=47 STAND for Unknow Informations object To get informations objets : getInformationObjects public InformationObject[] getInformationObjects()

Better to troubleshoot via Toolbox ST and use L3DIAG FOR EXAMPLE OR OTHER lined/edit point to see board diagnostic first prior to repair or replace that board....

Or are you referring to Link TR /RX leds..

Are you referring to The LED "ATTEN" if so there si different diagnostic messages acccordance to frequency of flashing and duration time ..

There are description on LED "status" diagnostic on PAIC yes..so can you tell us at least what is status .."flashing pattern " so I can try to check what is "message description" of the Flashing /flickering led...

So that on PAIC I/O pack ...i dont see such "circuit diagram/drawing " yet ... Maybe somebody else here can support!

Okay lets see if we got something about that circuit drawing..

Ok i only see Is400BPPCH2A for UCPA controller in OEM manual... And there is a good description for installing/replaceing kind board..but no drawing.. Can you tell us why you need the me,ntionned drawing as the board (BBPx ) Come installed on the Controller already ... A clarification would...

Good day ! Can you tell us which Type model of Control system are you referring to... James

Ok thanks for these inputs... @Curious_One Also i advise @Small_an_Engineer to check parameters related to this IBH like there shown in Mark6e APP CODE... There are some points that can be verified for smooth operation of the control valve...again look carefully on the app code that is...

Is there any kind of IBH "auto" test function implemented on this unit? If so did you perform it and right down /checked IBH parameters/signals as per Application code.. I advise you to do that...