Formula for Delta Temp Readings

[epuelsch]

Hi

I am having trouble getting a formula to work for a university project that I am working on. I have a test rig with 3 different thermal monitoring systems connected. There are temp sensors on electrical cables/connections and ambient sensors. I want to put in channels to get the delta T readings from a temp sensor on a connection to an ambient sensor. For example if a feeder temp sensor is Channel 101 and the ambient is Channel 102, what is the best way to write this formula? I’ve tried Cnl101-Cnl102 and other variations such as CnlVal(101)-CnlVal(102) and it either shows no reading or the server gets an error. Any help is appreciated.

[manjey73]

Documentation

Val(101)-Val(102)

[Mikhail]

Hi,
If status also should be taken into account,
Val(101) - Val(102); Stat(101)

[epuelsch]

Hi Mikhail

Thanks for the feedback. I realized that I had the channel as Input instead of calculated so once I changed that the formula mentioned above worked.
I am also trying to monitor the data connection health so I’ve put in a channel using the Stat function. I put it in the dashboard but was showing a 13 or 4 depending on connection quality. I added into the forumula to change it to a 1 or 0 and then changed the format to Error/Normal and that working. I am also trying to track if a device freezes. I noticed that one of my devices had readings that were frozen based on the last reading. Is there a way to have a channel for these sensors to flag when the reading freezes for more than 10-15 seconds or something like this? I am also ironing out some polling issues as I’m getting a lot of unreliable events. I think my times are too tight

[Mikhail]

Hi,
You should find a cause why a channel freezes. If there are polling errors in Communicator, we should find a solution how to change its status to undefined in Communicator, not on Server side.

[Author]

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