GE Power Management
MDP Digital Time Overcurrent Relay
7-
3
GEK-100682D
7 MODBUS PROTOCOL
7
7.4 MODBUS MEMORY MAP
Table 7–1: MODBUS MEMORY MAP (Sheet 1 of 4)
REGISTER CONTENTS
RANGE
TYPE
R/W
FORMAT CODE
BYTES
COMMNET
COMMAND
FIXED VALUE INPUT REGISTERS (READ HOLDING REGISTERS)
0000
Product ID
13h
RO
Unsigned Integer
1
80/01/01h
0001
Not assigned
0
RO
Unsigned Integer
1
0002
Commnet Address
N/A
RO
Unsigned Integer
1
0003
Modbus Address
N/A
RO
Unsigned Integer
1
0004
COC Software Version
N/A
RO
Float4 digit BCD with decimal between
2nd & 3rd digits
2
80/74/14h
0006
Model
N/A
RO
Unsigned Integer
00h:1 A; 01h: 5 A
1
80/02/00h
0007
Ground Settings Scale
00h to 03h
Unsigned Integer
00h: Nominal, 01h: divide by 2
02h: Multiply by 3, 03h: Divide by 5
1
80/02/00h
0008
Product Revision
0.00 to 99.99
RO
4 digit BCD with decimal between 2nd
and 3rd digits
2
80/01/05-06h
0010
MDP Software Revision
0.00 to 99.99
RO
4 digit BCD with decimal between
2nd and 3rd digits
2
80/01/02-03h
DYNAMIC VALUE INPUT REGISTERS
1000
Number of pending events
0 to 24
RO
Integer
1
1001
LED Status
0000h to 00FFh
RO
A bit set to 1 indicates the correspond-
ing LED is ON
b0: Ready, b1: Phase A, b2: Phase B,
b3: Phase C, b4: Ground, b5: TOC Trip,
b6: IOC Trip, b7: Pickup
1
80/74/00h
1002
Hardware Status
0000 to 008Fh
RO
b0: Breaker Status
(1 = Open,0= Closed)
b1: External Input, Block Ground
(1 = Active)
b2: External Input, Block IOC
(1 = Active)
b3: Settings Status
(1 = Settings changed but unentered),
0 = Settings Normal)
b4: Undefined, b5: Undefined
b6: Undefined
b7: Relay Status
(1= Fatal Error, 0=OK)
1
80/74/01h
1003
Phase A current
0 to 10 A (5 A relay)
0 to 2 A (1 A relay)
RO
Float
2
80/74/01-02h
1005
Phase B current
0 to 10 A (5 A relay)
0 to 2 A (1 A relay)
RO
Float
2
80/74/03-04h
1007
Phase C current
0 to 10 A (5 A relay)
0 to 2 A (1 A relay)
RO
Float
2
80/74/05-06h
1009
Ground current
0 to 3 A (5 A relay)
0 to 0.7 A (1 A relay)
RO
Float
2
80/74/07-08h