GE DGP Series Instruction Manual page 205

9 COMMUNICATIONS
The register maps have been designed by function basis as for GE-Modem to facilitate ease of design. For
example, the Set Date and Time function is implemented by writing to certain setpoint registers even though it
is not a part of the actual settings group. Settings are denoted by the register addresses with the most signifi-
cant two bits representing 01B. Reports are represented by addresses with most significant two bits having a
value of 00B. However, there are some control registers with in the report register map and they are read/write
registers for setting the appropriate registers. They are programmed by Function 06.
Table 9–2: MEMORY MAP ORGANIZATION
MEMORY MAP SECTION
Fixed Value Input Registers
Present Value Report
Registers
Event Report Register Map
Fault Status Register Map
Fault Report Register Map
Oscillography
DGP Status Register Map
MMI Passwords
Settings
Station and Generator ID
Range: 0000 to 001BH
The fixed value registers contain the PROM version number and other details which do not normally change in
the field. These registers are read only registers and read by Function Codes03/04.
Range: 0400 to 0431H
This register map specifies the present values report. The report is read by the master by using Function Code
03/04. Any attempt to write to these read-only registers causes an ILLEGAL ADDRESS exception to be
returned.
Status Bits Representation:
Register 0438H: EVENT/FAULT FLAG
bit 0 - New Event(s)
bit 1 - New Fault(s)
bit 2 - In time sync
bit 3 - Local Settings change started
bit 4 - Local Settings change Done
GE Power Management
ADDRESS RANGE DESCRIPTION
0000 to 001BH PROM version and other model details
0400 to 0431H DGP Present Values
0800 to 0B20H The last 100 events
0C00 to 0C18H Faults 1 to 3 header
1000 to 129DH Fault Report Summary for up to 3 faults
1400 to 17FFH Oscillography header, settings, and data
1800 to 180CH DGP status and self-test diagnostics
1C00 to 1C1FH Passwords
4000 to 5D05H DGP relay protection settings
7E00 to 7E1FH Station and Generator IDs
9.5.4 PRESENT VALUE REPORT REGISTER MAP
DGP Digital Generator Protection System
9.5 MODBUS MEMORY MAPPING
9.5.2 MEMORY MAP ORGANIZATION
9.5.3 FIXED VALUE INPUT REGISTERS
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