Phonetics Sensaphone SCADA 3000, User Manual

Page: 98 / 336

Figure 9: Source Data Points
Alarm Type : This parameter describes the source as being an analog value or a
digital value. There are three choices: Normally Open/Bit =0, Normally Closed/
Bit=1, and Limit.
If your source is an analog signal (e.g., temperature, or tank level) then choose
limit, as this type of signal will involve programming a high and low limit. Limit
is for a data point where values may fluctuate but must remain within a specified
range.
If your signal is a digital value (open/closed, 1 or 0) then choose the alarm type
that reflects the normal condition of your source. For example, if your source is
a contact closure on an input and it is normally closed (opens upon alarm), then
choose Normally Closed/Bit=1. Normally Open triggers an alarm if the circuit
closes. Normally Closed triggers an alarm if the circuit opens.
Low/High Limits : If your source is analog you must program low and high limits
to determine when an alarm condition exists. Low default is 0.0; high is 100.0.
Recognition Time : This is the time required for an out-of-tolerance condition to
qualify as an alarm event. The input must remain in that required state according
to chosen type continuously for this entire period of time in order to become an
alarm. The default is 3 seconds. The programmable range is from 0 minutes and
0 seconds to 1000 minutes and 40 seconds.
Reset Time : This is the time allowed for an acknowledged alarm’s fault condi-
tion to be corrected before the unit resets (reactivates) the alarm and begins the
dialout process all over again. Default of 0 hours and 0 minutes means that the
alarm reset feature is disabled. The programmable range is from 0 hours and 0
minutes to 1000 hours and 40 minutes.
Example: The alarm reset time is set to 3 hours. At 1 a.m., an alarm occurs
on input 7. The unit calls Destination 1 and the person who answers the call
acknowledges the alarm. Three hours later the fault condition still exists, and the
alarm reactivates and begins the dialing sequence again.
11-14
SCADA 3000 User’s Manual