SCADAPack Controllers

compared with
Current by Allan Joy Regpala
on Mar 13, 2017 15:45.

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h1. Problem


The screnshot below shows logic that scales the raw value of input 30001 to produce a scaled value in register 40110 (in mA)
!AI out of range 5-20.png|border=1!
!AIN_Alarm.png|border=1,width=868,height=733!

{info} 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.{info}


The screnshot below shows logic that scales the raw value of input 30001 to produce a scaled value in register 40110 (in mA)

!AI out of range 10-40.png|border=1,width=867,height=698!
{info} With the 10V/40mA register assignment, register 30001 can now measure beyond 20mA so it is now possible to tell a full scale value apart from an out of range value. Full scale 20mA now corresponds to a raw input value of 16384. The logic is looking for an out of range condition when it sees 20.01mA or greater.{info}