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:
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
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