Formulas check '-'

[scadarapid]

Hi.
Can I use formula to check “-” value when the communication has lost.
I use modbusRTU and I have a sensor which is discrete input register.
When the communication has lost, I have noticed that my sensor value became “-” so, i need to check if my sensor has lost communication my output should be equal 150.

public double check(double sensor)
{
double output = sensor;
if( sensor == null ){
return output = 150;
}
return output;
}

Thank you so much.

[scadarapid]

I use this formula but it does not work. when the communication has lost the output value become zero. but i need it to become 150.

Thank you so much.

[manjey73]

Look for formulas to check the signal status on the forum or try to change the formula to double.NaN

[Mikhail]

Hi,

if (CnlStat > 0) …

[scadarapid]

I use this formula to hold the old value and it works.

Stat(2001) > 0 ? inputtest(Val(2001), Val(4003), Val(4002)) : Cnl

Thank you so much

[Mikhail]

Take into account that
CnlStat – the status that was just received from Communicator
Stat(N) – the current status of an input channel before receiving new status

[kumajaya]

Can we just have an option to hold last valid value?

[Mikhail]

Can we just have an option to hold last valid value?

Formula would be like
CnlStat > 0 ? Cnl : Val(); CnlStat > 0 ? CnlStat : Stat()

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