
CHAPTER 12: ABOUT THE MODBUS MEMORY MAP
COMPATIBILITY MODE
8 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
12-3
Compatibility Mode
The 8 Series relay supports emulation of the SR750/SR469 Modbus memory map for
retrofit applications. The emulation supports typical actual value data for common data
items. When enabled, the 8 Series relay responds to Modbus packets from a PLC as if it
were a legacy SR relay.
The compatibility mode is only available for RS485 and rear Ethernet ports. (The USB and
Wifi always respond using the 8 Series memory map.)
When in compatibility mode, the rear Ethernet ports support setting changes for
Compatibility mode, Set date and time, Clear events, and Event retrieval.
User Map
When using the default user map in compatibility mode, the user is required to enter the
Modicon format for the address that is being read in the user map. The Modicon format
has an offset of 30001, and thus is different from the values found in the SR publications.
For convenience, the translated values have been included in the tables below. The user
map can only be entered in an offline file, and the compatibility mode must be set to
SR469 or SR750, depending on the product being used.
The user map implementation is the same function as covered in the section
Accessing
Data via the User Map
. The only difference is that the read function starts at 0100h (256
Dec) to correspond to the SR469/SR750 map.Range: User Map #1 (0100h) to User Map
#125 (017Ch)
Example:
PLC requests Phase A current from SR469 = 0300h (HEX) using User Map #1 = 0100h
Default User Map #1 in 8 Series PC SW = 30769 (Dec) => SR469 = 768 (Dec) = 0300h(HEX)
The following tables list the addresses supported in compatibility mode for both SR469 and
SR750. The SR Hex and decimal values are provided with the corresponding 8 Series value.
Table 12-3: SR469 Addresses supported in Compatibility Mode
469 HEX
469 Decimal
Modicon Format
(Needed for User Map)
Description
0000
0
30001
Product Code
0001
1
30002
Hardware Revision
0002
2
30003
Firmware Version
0010
16
30017
Boot
00F0
240
30241
Time
00F2
242
30243
Date
0201
513
30514
Motor Thermal Capacity Used
0202
514
30515
Estimated Trip Time on OL
0204
516
30517
Motor Speed
0211
529
30530
CO Outputs
0300
768
30769
J1 Ia RMS
0302
770
30771
J1 Ib RMS
0304
772
30773
J1 Ic RMS
0306
774
30775
J1 I AVG
0308
776
30777
Motor Load
0309
777
30778
Motor Current Unbalance
030A
778
30779
Therm Model Biased Load
030B
779
30780
J1 Ig RMS
030D
781
30782
Ia Diff
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