YuriSarcas
Member
I am trying to get a Quick Panel to read a negative value from a modbus register. All it will display is a 0 when the value is negative but reads correctly when the value is positive. Has anyone had to deal with this issue?
Help with a QuickPanel using Proficy
- Thread starter YuriSarcas
- Start date
Fred_Loveless
Member
Do you have the data type of the register you are reading set to Word or Short. Word is a UINT16 where as short is an INT16 or signed 16 bit integer. I suspect you are seeing a very large number when you RTU has a negative number.
See also:
http://www.eng-tips.com/viewthread.cfm?qid=337985
More details in the question i.e. which model QP, is this the master and who the other MB device is along with network type etc. may get a more detailed answer from someone.
http://www.eng-tips.com/viewthread.cfm?qid=337985
More details in the question i.e. which model QP, is this the master and who the other MB device is along with network type etc. may get a more detailed answer from someone.
Last edited:
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