38
At 8:00PM the time schedule will turn the lights off, with a priority of LOW, releasing control of the relay to other inputs. The wall
switch will now perform both ON and OFF commands until the next masking period starts at 7:00AM.
Example 3: The project has an indoor photocell that turns ON or OFF interior lights nearest the windows as needed using ON and
OFF light level set points. The desired programming is to turn OFF lighting entirely at 8:00PM and enable the photocell to run the
lighting starting at 7:00AM.
Example 3 Programming Steps:
1. Set up the photocell with the ON command at a priority = NORMAL (Default) ON and the OFF command at a priority =
NORMAL OFF.
2. Set up the Time Schedule at 8:00PM to issue a priority = HIGH OFF.
3. Set up a Time Schedule at 7:00AM to issue a priority = LOW ON.
How it works:
The 8:00PM priority = HIGH OFF schedule goes through. All lights that are currently ON from photocell priority = NORMAL ON will
turn OFF because the schedule OFF is a higher priority. Any additional ON or OFF commands from the photocell will be ignored
until the 7:00AM priority=LOW ON command goes through.
The time schedule priority = LOW ON goes through at 07:00. This command releases the higher priority ON command and gives
control back to the photocell. In this case, lights that are in areas that the photocell is in the ON state will turn on or if the photocell
is in the OFF state they will not turn ON. This occurs because both the OFF and ON state of the photocell are higher priorities
than the ON command of the schedule.
Example 4: The project has a re system that gives the lighting system a dry contact closure when the alarm goes on. This
closure is connected to one of the auxiliary inputs on the CX Panel. In an alarm event, all of the emergency lighting is to turn on
and remain on regardless of wall switch state or time schedules when an alarm happens. When the alarm system is turned off by
the re department the all lighting is to resume its normal scheduled state.
Example 4 Programming Steps
1. Set the re alarm input ON command as priority = MASTER ON.
2. Set the re alarm input OFF command as priority = LOW.
3. Set the time schedules and other inputs to be priority = NORMAL level.
How it works:
Normal commands go through to control relays in a NORMAL level. Because commands are all at the NORMAL level, they can
override each other.
For the purposes of this example, we will say that the last command to this relay was an ON command from a wall switch.
When the re alarm input sends an ON command, the designated lighting will go ON, at a MASTER priority level.
When the re alarm input is turned OFF it will issue a priority = LOW OFF command. The CX Panel will re-evaluate and give
control of the relays to the last command at the NORMAL level, in this case the wall switch.
Masking
Masking can be applied to Inputs and Outputs. The purpose of masking is to block actions or events for selected periods of time.
When selecting and programming Masking, it is essentially like programming a schedule, (see Schedules), to NOT function.
To Next Page
Loading...
