Compatibility Mode - GE Multilin 850 Communications Manual

CHAPTER 12: ABOUT THE MODBUS MEMORY MAP

Compatibility Mode

8 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
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
0000 0
0001 1
0002 2
0010 16
00F0 240
00F2 242
0201 513
0202 514
0204 516
0211 529
0300 768
0302 770
0304 772
0306 774
0308 776
0309 777
030A 778
030B 779
030D 781
Modicon Format Description
(Needed for User Map)
30001 Product Code
30002 Hardware Revision
30003 Firmware Version
30017 Boot
30241 Time
30243 Date
30514 Motor Thermal Capacity Used
30515 Estimated Trip Time on OL
30517 Motor Speed
30530 CO Outputs
30769 J1 Ia RMS
30771 J1 Ib RMS
30773 J1 Ic RMS
30775 J1 I AVG
30777 Motor Load
30778 Motor Current Unbalance
30779 Therm Model Biased Load
30780 J1 Ig RMS
30782 Ia Diff
COMPATIBILITY MODE
12-3