12-2
8 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
MEMORY MAP ORGANIZATION
CHAPTER 12: ABOUT THE MODBUS MEMORY MAP
The 8 Series relay 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 8 Series relay 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.
NOTE
NOTE:
Many Modbus drivers add 40001 (for settings) or 30001 (for actual values) to the actual
address of the register addresses. For example, if settings address 0h was to be read, then
40001d would be the address required by the Modbus communications driver; similarly, if
settings address 320h (800d) was to be read, then 40801d would be the address required
by the Modbus communications driver.
Table 12-2: Memory Map Organization
User Map Address 9,10
Virtual Input Status 1-32
30714
30715
User Map Address 11, 12
Virtual Output Status 1-32
30718
30719
User Map Address 13,14
Remote Input 1-32
30728
30729
User Map Address 15,16
Remote Output 1-32
30736
30737
User Map Address 17,18
Ia
31270
31271
User Map Address 19,20
Ib
31272
31273
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
30001 to 30079
Identification and revision information.
Actual Values
30241 to 30308
Actual values. Read Only.
30660 to 35559
User Map Values
30524 to 30648
User Map Values. See the previous section for
details.
Setpoints
40001 to 40008
Setpoints data. Read and Write.
40230 to 40303
40692 to 102866
Commands
40129 to 40140
Substitute command locations. Read and write.
User Map Setpoints
40524 to 40648
User map setpoints. Configures user map
values
