Date Code 20090730 Instruction Manual SEL-734 Meter
Appendix E
Distributed Network Protocol
Overview
The SEL-734 Meter supports Distributed Network Protocol (DNP3) Level 2
Slave protocol. This includes access to metering data, contact I/O, targets,
sequential events recorder, meter summary event reports. The SEL-734 also
supports DNP point remapping.
Binary Inputs
The SEL-734 can write Meter Word Bits to the DNP master using Binary
Inputs. The SEL-734 updates binary inputs 0–799 and 1600–1643
approximately once per second. The time stamps for binary input events may
be up to two seconds behind the time of actual occurrence. The meter only has
one row of LEDs (fault targets) and the upper byte represents targets. This
means that 0000001 will read 256.
The SEL-734 derives binary inputs 800–1599 from the Sequential Events
Recorder (SER), that are updated once per second with a time stamp of actual
occurrence. Only points recorded in the SER1, SER2, or SER3 lists (SET R)
generate events.
Binary Outputs
The DNP master can assert and deassert SEL-734 remote bits, reset energy,
and reset demand by writing binary outputs to the SEL-734.
Binary outputs allow external control of:
➤ Remote bits
➤ Remote bit pairs
➤ Contact outputs
➤ Next event bit
➤ Reset energy or demand through a remote bit
Binary/Frozen
Counters
The SEL-734 updates binary counters once per second and reports a
time-stamped event when a counter value changes beyond its deadband
setting. The time stamps for binary counter events may be up to two seconds
behind the time of actual occurrence.
Three types of data are available as binary counters:
➤ SELOGIC Counters
➤ Energy
➤ Load Profile Records
Courtesy of NationalSwitchgear.com
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