4-7
2nd Input Qualifier. The 2nd input qualifier, which is connected to the 1st
input qualifier by an AND (i.e, both qualifiers must be true), checks to see if the
heat sensor is at a temperature of less than or equal to 50 degrees. Its
programming is very similar to the 1st input statement.
1. Select the COMPARE opcode and the COUNTS (constant) qualifier.
2. Specify 50 in the Counts box and select the AND radio button in the top left
corner.
3. Choose the less than or equal to (<=) operator for the 50 count.
1st Output Qualifier. This output tracks the input. That means that a
supervisory message (“Water Tank Temp Warning”) is sent to the panel when
the temperature range is between 38 and 50. This supervisory cannot be cleared
until the temperature is outside of the 38 to 50 degree range.
2nd Output Qualifier. This output tracks the input as well. Its function,
however, is to turn on a relay connected to a water heater while the temperature
range is between 38 and 50. As soon as the temperature is out of this range, the
relay goes off.
Figure 4-3. Example Custom Control Non Latching / Non Alarm
Programming a Utility Monitoring Point, Continued
Step 4. Program Custom
Control Equations (continued)
Input 1
Input 2
Output 1
Output 2
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