Schweitzer Engineering Laboratories SEL-734 - Table E.1 VSSI Record Status Report Definitions; Table E.2 Phase SSI Column Definitions

E.3
Date Code 20090730 Instruction Manual SEL-734 Meter
Distributed Network Protocol
Overview
➤ Monitor the VSSI Data Ready Counter Input flag and read after
the bit is set.
The status of a VSSI record is reported as defined as follows (see Table 6.6):
The Phase SSI columns are defined as follows (see Table 6.5):
Analog Inputs
The SEL-734 reports analog input quantities to the master optimized for all
quantities except for energy values. Analog inputs peak at their binary
full-scale values, 2
32
or 2
16
depending on variation, and do not roll over.
Analog inputs represent angles in degrees, scaled by 100.
Analog Outputs
The SEL-734 accepts analog output values from the master for use in
SEL
OGIC control equations and the 4AO/4DO output card. Analog outputs
can also write the time and date of load profile records available through
binary counters.
Miscellaneous
➤ Object 50 (Time and Date): Object 50 polls return the internal
time and date of the SEL-734.
➤ Object 60 (Class Data): Object 60 polls return Class 0, 1, 2, and
3 data assigned to the ECLASSB, ECLASSC, and ECLASSA
settings.
➤ Object 80, (Internal Indications): Object 80 polls return the
internal indicator (IIN) bits specified by the DNP protocol. The
SEL-734 sets the “Device Trouble” bit if the meter is disabled.
Write “0” to bit 7 to clear the “Restart” bit.
Table E.1 VSSI Record Status Report Definitions
DNP Value VSSI Definition
0Not Ready
1 R (Ready)
2 P (Predisturbance)
3 F (Fast recording mode)
4 E (End)
5 M (Medium recording mode)
6 S (Slow recording mode)
7 D (Daily recording mode)
8 X (Data overflow)
9 Checksum Error (all other values will be 0)
10 Data Overwrite (all other values will be 0)
Table E.2 Phase SSI Column Definitions
DNP Value VSSI Definition
0 . (No bits asserted phase)
1 O (Overvoltage)
2 U (Undervoltage)
3 I (Interruption)
Courtesy of NationalSwitchgear.com