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- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
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from the Automation department...
Analog values in Modbus protocol
How to calculate the actual analog input value in Modbus protocol?
You have to convert the byte array of the reply from the plc to an analog number. Make sure the number the plc is sending is an integer value or a real floating point value. If what you get is a floating point value it seems that you have to use the IEEE 754-1985 algorithm to make the conversion. Google it or take a look on what the wikipedia says:
http://en.wikipedia.org/wiki/IEEE_754
http://en.wikipedia.org/wiki/IEEE_754
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Above articles copyright 2008 Reed Business Information.
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