GE 469

COMMUNICATIONS GUIDE MODBUS MEMORY MAP
469 MOTOR MANAGEMENT RELAY – COMMUNICATIONS GUIDE 15
Event Recorder
The 469 event recorder data starts at address 3000h. Address 3003h is a pointer to the
event of interest (1 representing the latest event and 256 representing the oldest event). To
retrieve Event 1, write ‘1’ to the Event Record Selector (3003h) and read the data from
3004h to 3035h. To retrieve Event 2, write ‘2’ to the Event Record Selector (3003h) and read
the data from 3004h to 3035h. All 256 events may be retrieved in this manner. The time
and date stamp of each event may be used to ensure that all events have been retrieved in
order without new events corrupting the sequence of events (Event 1 should be more
recent than Event 2, Event 2 should be more recent than Event 3, etc.).
Each communications port can individually select an Event ID number by writing address
to 3003h. This allows the front port, rear port, and auxiliary port to read different events
from the event recorder simultaneously.
Waveform Capture
The 469 stores a number of cycles of A/D samples each time a trip occurs in a trace buffer.
The trace buffer is partitioned according to the
S1 PREFERENCES  TRACE MEMORY BUFFERS
setpoint. The Trace Memory Trigger is set up with the S1 PREFERENCES  TRACE MEMORY
TRIGGER
setpoint and this determines how many pre-trip and post-trip cycles are stored.
The trace buffer is time and date stamped and may be correlated to a trip in the event
record. 10 waveforms are captured this way when a trip occurs. These are the 3 phase
currents, 3 differential currents, ground current and 3 voltage waveforms. This information
is stored in volatile memory and will be lost if power is cycled to the relay.
User Map Address #36 0123 032B RTD #11 temperature
User Map Address #37 0124 032C RTD #12 temperature
User Map Address #38 0125 0340 Vab
User Map Address #39 0126 0341 Vbc
User Map Address #40 0127 0342 Vca
User Map Address #41 0128 0343 Average line voltage
User Map Address #42 0129 0348 System frequency
User Map Address #43 012A 0370 Power factor
User Map Address #44 012B 0371 Real power (1st word)
User Map Address #45 012C 0372 Real power (2nd word)
User Map Address #46 012D 0374 Reactive power (1st word)
User Map Address #47 012E 0375 Reactive power (2nd word)
User Map Address #48 012F 0376 Apparent power
User Map Address #49 0130 030D Phase A differential current
User Map Address #50 0131 030E Phase B differential current
User Map Address #51 0132 030F Phase C differential current
User Map Address #52 0133 02D5 Assignable switch #1 status
User Map Address #53 0134 02D6 Assignable switch #2 status
User Map Address #54 0135 02D7 Assignable switch #3 status
User Map Address #55 0136 02D8 Assignable switch #4 status
Table 1: Default assignments for User-Definable Memory Map Area
USER MAP ADDRESS #
MODBUS
REGISTER
ADDRESS (HEX)
USER ASSIGNED
ADDRESS (HEX)
DESCRIPTION