I was displaying a signed integer from my PLC which was a negative value but Lookout would only display it as an unsigned integer ( -5 from PLC was shown as 65530 in Lookout). The negative value is due to a small offset in my analog input module. I then tried scaling the data member from raw -5 to 2000 and eng. units 0 - 400 and it didn't do what I expected. Am I missing something here?
Are you sure you are accessing the right registers? If you are using the modbus object please take a look at the modbus datamembers helpfile in Lookout help to see what data types are represent by different range registers.
I'm using an integer value. It is displayed in the PLC as -32767 to +32767 (its a Mitsubishi register, D0). When I monitor it in the PLC it reads -5, in Lookout it reads 65530.
