Reliability Check and Merge blocks in Johnson Controls CCT
In this video tutorial, I will show you how the Reliability Check and Reliability Merge blocks in CCT work.
I will show you how to detect when a sensor fails or goes unreliable, so you can Execute some Custom Logic or Notify a Metasys operator by sending out an Alarm.
Also, you will learn how to change your Sensor's reliability range from CCT and Metasys. That is the Min and Max Values parameters in your analog inputs.
If your sensor goes unreliable or Out of Range, you can decide to Hold its last Reliable Value or you can even go to a Default Value.
BONUS: I will show you a simple but powerful trick that will allow you to hold the output of your PID as soon as you lose your sensor.
Chapters
0:00 Intro
1:06 Reliability Check
2:10 Where to find this Block
2:42 Example 1 - Execute Logic
3:50 Example 1 - Metasys Alarm
5:55 Example 2 - Any Sensor Unreliable "OR"
7:44 Min and Max Values
10:23 Change Min-Max from Metasys
11:39 Reliability Merge
13:46 Example 3 - Hold Last Value
15:34 Example 3 - Go To Default Value
18:30 Bonus
19:54 End