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How do I Monitor Analog Input Over-Under Range conditions on a SCADAPack 350?
Only the Scadapack models 314, 334 and 357 (only AI on the 5606 Lower IO board) have register assignments that monitor the out-of-range status for analog inputs.
The only way to monitor if an analog input has failed, would be to monitor the raw input and look for a zero or full scale value.
For a SP350 using a 5V/20mA register assignment and a 4-20mA input:The screen shot below shows logic that scales the raw value of input 30001 to produce a scaled value in register 40110 (in mA)
With the 5V/20mA register assignment, a count of 32767 will appear when seeing a full scale value or an out of range value. In either scenario, the mA reading will never go above 20mA which is why the threshold has been set to 19.99mA.
For a SP350 using a 10V/40mA register assignment and a 4-20mA input:
The screen shot below shows logic that scales the raw value of input 30001 to produce a scaled value in register 40110 (in mA)
Julkaistu:Schneider Electric Suomi
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