GE 869 - Memory Map Organization; MODBUS Memory Map

CHAPTER 11: MODBUS MEMORY MAP MEMORY MAP ORGANIZATION
869 MOTOR PROTECTION SYSTEM – COMMUNICATIONS GUIDE 11-3
The 869 supports 32-bit Modbus items to be configured in the user map. When such an
address is configured in the user map for example at user map address 1, user map
address 2 is also consumed by the same item irrespective of the address assigned in
address 2.
Memory Map Organization
The 869 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 communications driver.
Table 11-2: Memory Map Organization
MODBUS memory map
User Map Address 21,22 Ic 31274 31275
User Map Address 23,24 In 31278 31279
User Map Address 25,26 Iavg 31295 31296
User Map Address 27,28 Ig 31276 31277
User Map Address Description Modbus Address
Memory Map Section Address Range Description
Product ID 0000h to 007Fh Identification and revision information.
Commands 0080h to 00FFh Substitute command locations. Read and write
access.
User Map 0100h to 01FFh User Map Values and Addresses. See the
previous section for details.
Actual Values 0200h to 0FFFh Actual values data. Read Only.
Setpoints 1000h to 1FFFh Setpoints data. Read and Write.
Event Recorder, Trace
Memory, and Data Logger
2000h to 2FFFh See relevant sections in this chapter for details.
Reserved 3000h to 3FFFh Reserved for future use.
Factory Service Data 4000h to FFFFh Reserved.
Modbus
Address
Hex
Address
Description Min Max Step Units Format
Code
Factory
Default
Size in
Words
Actual Values
Product Information
30001 0x0000 Product Code 0 65535 1 F0 0 1
30002 0x0001 Hardware Revision 0 26 1 FC110 1 1
30003 0x0002 Firmware Version 0 65535 1 F2 140 1