Using The Modbus User Map; Modbus User Map - GE 345 Communications Manual

CHAPTER 1: COMMUNICATIONS GUIDE

Using the MODBUS User Map

MODBUS User Map

345 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
345 relay units incorporate a powerful feature called Modbus User Map, that allows the
user to read 125 non-consecutive data records.
A master computer will often have to interrogate continuously several connected slave
relays. If the values being read are "randomly" positioned along the memory map, reading
them may require several transmissions, and this may cause a communications overload.
Data records that are positioned in this manner in the memory map, can be remapped to
the address of an adjacent record in the User Map area, so that they can be accessible to
the master computer with only a single read operation.
To program the map this way, addresses for the required records must be written in the
index area, which is located at the addresses from 40524 (0x020B) to 40648 (0x287).
Only single data from the Actual Values subset can be set in the map. The ranges of
addresses that can be configured in that index area are:
Range1 : 30001 to 30523 (Product Device Code to Internal Fault Cause)
[The address 30302 (Current Security Access Level) cannot be configured.]
Range2 : 30946 to 32036 (Alarm Status 4 to Last Actual Values Register)
The values that correspond to the points provisioned in the User Map index (40524
(0x020B) to 40648 (0x287)) may be read from the Actual Values map area located at the
addresses from 30524 (0x020B) to 30648 (0x0287).
Table 42: User Map Settings
MODBUS Hex Description
Address Address
40524 20B User Map Address 1
40525 20C User Map Address 2
40526 20D User Map Address 3
40527 20E User Map Address 4
40528 20F User Map Address 5
40529 210 User Map Address 6
40530 211 User Map Address 7
40531 212 User Map Address 8
40532 213 User Map Address 9
40533 214 User Map Address 10
40534 215 User Map Address 11
40535 216 User Map Address 12
40536 217 User Map Address 13
40537 218 User Map Address 14
40538 219 User Map Address 15
40539 21A User Map Address 16
40540 21B User Map Address 17
40541 21C User Map Address 18
40542 21D User Map Address 19
40543 21E User Map Address 20
40544 21F User Map Address 21
40545 220 User Map Address 22
USING THE MODBUS USER MAP
Min Max Step
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
30001 43763 1
Format Factory
Code Default
F1 30305
F1 30505
F1 30506
F1 30960
F1 30961
F1 30958
F1 30959
F1 30956
F1 30957
F1 30954
F1 30955
F1 30952
F1 30953
F1 30950
F1 30951
F1 30948
F1 30949
F1 30946
F1 30947
F1 30976
F1 30977
F1 30974
1–179