Some information on how to adjust the analog input of the Tixi Alarm Modem:
1. Requirements
After a "factory reset" and without "periphery" database the analog input is set to range 0-10000 (10V=10000).
If a "periphery" with Numerator/Denominator = 1/1 is loaded, one will get the raw 12Bit range 0-3798 (10V=3798 +/- 38 )
[<SetConfig _="PROCCFG" ver="v">
<Periphery>
<Module Name="ADC 1*12bit" Address="C9a">
<Numerator _="1"/>
<Denominator _="1"/>
<Tolerance _="1"/>
<Rate _="1000"/>
</Module>
</Periphery>
</SetConfig>]
2. Examples
2.1. Display 10 at 10V
To to get a range 0-10 (10V=10), there are two solutions:
2.1.1 Periphery
Use the "periphery" database to adjust the range:
10V = 3798*(10/3798)
[<SetConfig _="PROCCFG" ver="v">
<Periphery>
<Module Name="ADC 1*12bit" Address="C9a">
<Numerator _="10"/>
<Denominator _="3798"/>
<Tolerance _="1"/>
<Rate _="1000"/>
</Module>
</Periphery>
</SetConfig>]
2.1.2 ProcessVar
OR (!) load the AI into a process variable to define decimal places using the "format" option
(10V = 10,000):
[<SetConfig _="PROCCFG" ver="v">
<ProcessVars>
<AI format="F,3">
<Value>
<LD _="/Process/MB/A/AI/P0"/>
</Value>
</AI>
</ProcessVars>
</SetConfig>]
2.2 Display 30 at 10V
To get a range 0-30 (10V=30), there are two solutions:
2.2.1 Periphery
Use the periphery to adjust the range:
10V = 3798*(30/3798)
[<SetConfig _="PROCCFG" ver="v">
<Periphery>
<Module Name="ADC 1*12bit" Address="C9a">
<Numerator _="30"/>
<Denominator _="3798"/>
<Tolerance _="1"/>
<Rate _="1000"/>
</Module>
</Periphery>
</SetConfig>]
2.2.2 ProcessVar
OR load the AI into a process variable and use math operations for the calculation: 10V = 10000/1000*3
[<SetConfig _="PROCCFG" ver="v">
<ProcessVars>
<AI>
<Value>
<LD _="/Process/MB/A/AI/P0"/>
<DIV _="1000"/>
<MUL _="3"/>
</Value>
</AI>
</ProcessVars>
</SetConfig>]
2.3 Display 500 at 3V
To get a range 0-500 (3V=500), there are two solutions:
2.3.1 Periphery
Use the "periphery" database to adjust the range:
3V = 3798*(3/10)*(500/(3798*(3/10))) = 1139,4*(500/1139,4) = 11394*(5000/11394)
[<SetConfig _="PROCCFG" ver="v">
<Periphery>
<Module Name="ADC 1*12bit" Address="C9a">
<Numerator _="5000"/>
<Denominator _="11394"/>
<Tolerance _="1"/>
<Rate _="1000"/>
</Module>
</Periphery>
</SetConfig>]
2.3.2 ProcessVar
OR (!) load the AI into a process variable and use math operations for the calculation: 3V = 500 = 3000/6
[<SetConfig _="PROCCFG" ver="v">
<ProcessVars>
<AI>
<Value>
<LD _="/Process/MB/A/AI/P0"/>
<DIV _="6"/>
</Value>
</AI>
</ProcessVars>
</SetConfig>]
3. Application
The calculated analog value is now available within the process variable "AI" and may be included into message texts.
The reference to the calculated value is: ®/Process/PV/AI;
The calculated value may even be queried manually:
[<Get _="/Process/PV/AI" ver="y"/>]
_________________
Tixi Support Team
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Tixi-Support@tixi.com
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