Siemens ACCESS 9340 Reference Manual page 249

PMCM-9340D-0208 ACCESS 9340 and 9360 Meters
2/2008 Appendix D—Glossary
APPENDIX D—GLOSSARY
Terms
accumulated energy—energy can accumulates in either signed or unsigned
(absolute) mode. In signed mode, the direction of power flow is considered and the
accumulated energy magnitude may increase and decrease. In absolute mode, energy
accumulates as a positive regardless of the power flow direction.
active alarm – an alarm that has been set up to trigger, when certain conditions are
met, the execution of a task or notification. An icon in the upper-right corner of the meter
indicates that an alarm is active (!). See also enabled alarm and disabled alarm.
baud rate—specifies how fast data is transmitted across a network port.
block interval demand— power demand calculation method for a block of time and
includes three ways to apply calculating to that block of time using the sliding block,
fixed block, or rolling block method.
communications link—a chain of devices connected by a communications cable to a
communications port.
current transformer (CT)—current transformer for current inputs.
demand—average value of a quantity, such as power, over a specified interval of time.
device address—defines where the meter resides in the power monitoring system.
disabled alarm – an alarm which has been configured but which is currently "turned
off"; i.e, the alarm will not execute its associated task even when its conditions are met.
See also enabled alarm and active alarm.
enabled alarm – an alarm that has been configured and "turned on" and will execute its
associated task when its conditions are met. See also disabled alarm and active alarm.
event—the occurrence of an alarm condition, such as Undervoltage Phase A,
configured in the meter.
firmware—operating system within the meter
fixed block—an interval selected from 1 to 60 minutes (in 1-minute increments). The
meter calculates and updates the demand at the end of each interval.
float—a 32-bit floating point value returned by a register (see Appendix A—Meter
Register List on page 119). The upper 16-bits are in the lowest-numbered register pair.
For example, in the register 4010/11, 4010 contains the upper 16-bits while 4011
contains the lower 16-bits.
frequency—number of cycles in one second.
line-to-line voltages—measurement of the rms line-to-line voltages of the circuit.
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