Unitary | Pre-APOGEE | APOGEE | BACnet | PXC.A |
|---|---|---|---|---|
| ● | ● | ● | ● |
Syntax
DCR(pt1,temp1,high1,low1,...,pt4,temp4,high4,low4)
pt1 through pt4 | Point names of the output points to be duty cycled. - This parameter can be an LDO, logical, physical, or virtual point type. |
temp1 through temp4 | Point names of the space temperature points. |
high1 through high4 | High temperature limits of the space points. - This parameter can be a decimal, integer, point name, or local variable. |
low1 through low4 | Low temperature limits of the space points. - This parameter can be a decimal, integer, point name, or local variable. |
Use
Duty cycles an output point to keep a corresponding temperature within the low and high values of a dead band.
- Makes an ON/OFF decision every 5 minutes according to the value of the parameters.
- The output point is commanded ON when the temperature point value is above the high limit or below the low limit.
- The output point is commanded OFF when the temperature point value is within the range of the high and low limits.
- For each point, a space temperature, high temperature, and low temperature parameter must be defined.
- A maximum of 4 points can be controlled with one DCR command.
Example
200 C THIS COMMAND WILL TURN ON IF
210 C SFAN'S VALUE FALLS BELOW 68 OR
220 C RISES ABOVE 78. THE POINT SFAN01
230 C WILL REMAIN ON/OFF FOR AT LEAST 5
240 C MINUTES ON EACH CYCLE.
250 DCR(SFAN01,RM109,78.0,68.0)
Notes
The DCR command has a priority of NONE. Therefore, the PPCL program must be structured with IF/THEN/ELSE commands to prevent conflicts between DCR and other commands with the same priority.
See also the DC topic.