Memory Map Organization - GE Feeder Management Relay 750 Instruction Manual

7.3 MODBUS OPERATIONS
The User Memory Map is only intended to be used to READ data in a proficient manner for the master computer.
The communication system should not be configured in a manner that generates WRITES to these locations con-
NOTE tinuously, as these settings are stored in the EEPROM that has a maximum of 100000 program/erase cycles.
Table 7–4: USER MAP REGISTER ADDRESSES
DATA REGISTER
DESCRIPTION
General Status
Active Condition
Phase A RMS Current
Phase B RMS Current
Phase C RMS Current
Phase CT Primary
The 750/760 Memory Map describes all the data registers that can be accessed via serial communications. The Memory
Map address range is grouped into several categories as outlined in the following table. All memory map locations are two
byte (16 bit) values. The remaining pages of this chapter list all locations of the Memory Map. Addresses for all locations
are shown in hexadecimal. Consult the range, step, units, and the data format (listed after the memory map) to interpret
register values.
Many Modbus communications drivers add 40001d to the actual address of the register addresses. For example, if
address 0h was to be read, then 40001d would be the address required by the Modbus communications driver;
similarly, if address 320h (800d) was to be read, then 40801d would be the address required by the Modbus com-
NOTE
munications driver.
Table 7–5: MEMORY MAP ORGANIZATION
MEMORY MAP SECTION
Product ID
Commands
User Map
Actual Values
Setpoints
7
Event Recorder, Trace
Memory, Data Logger
Reserved
Factory Service Data
7-12
Courtesy of NationalSwitchgear.com
VALUES TO STORE IN LOCATIONS IN USER MAP
USER MAP ADDRESSES VALUES TO READ DATA
Store 0200h at 0180h
Store 0210h at 0181h
Store 0300h at 0182h
Store 0301h at 0183h
Store 0302h at 0184h
Store 1100h at 0185h
ADDRESS RANGE DESCRIPTION
0000h to 007Fh Identification and revision information.
0080h to 00FFh Substitute command locations. Read and write access.
0100h to 01FFh User Map Values and Addresses. See the previous section for details.
0200h to 0FFFh Actual values data. Read Only.
1000h to 1FFFh Setpoints data. Read and Write.
2000h to 2FFFh See relevant sections in this chapter for details.
3000h to 3FFFh Reserved for future use.
4000h to FFFFh Reserved.
750/760 Feeder Management Relay
0100h
0101h
0102h
0103h
0104h
0105h

7.3.8 MEMORY MAP ORGANIZATION

7 COMMUNICATIONS
GE Multilin