Function Code 05H: Execute Operation - GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual

8 COMMUNICATIONS
Modbus implementation:
GE Power Management implementation:
This function code allows the master to perform various operations in the 745. The 2 byte CODE VALUE of
FF00h must be sent after the OPERATION CODE for the operation to be performed.
MESSAGE FORMAT AND EXAMPLE:
Request to perform reset operation in slave device 11.
Master Query Message:
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE: high order byte
OPERATION CODE: low order byte
CODE VALUE: high order byte
CODE VALUE: low order byte
CRC: low order byte
CRC: high order byte
Field:
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE: high order byte
OPERATION CODE: low order byte
CODE VALUE: high order byte
CODE VALUE: low order byte
CRC: low order byte
CRC: high order byte
Table 8–2: SUMMARY OF OPERATION CODES FOR FUNCTION CODE 05H
OPERATION DEFINITION
CODE
0000 NO OPERATION
0001 REMOTE RESET
0002 TRIGGER TRACE
MEMORY
0003 CLEAR MAXIMUM
DEMAND DATA
0004 CLEAR EVENT
RECORDER DATA
0005 CLEAR LOSS-OF-
LIFE DATA
0006 CLEAR TRACE
MEMORY
0007 CLEAR ENERGY
DATA
GE Power Management

8.2.10 FUNCTION CODE 05H: EXECUTE OPERATION

Force Single Coil
Execute Operation
Example (hex):
11 query message for slave 11
05 execute operation
00 remote reset
01
FF perform operation
00
DF
6A
Example (hex):
11 response message from slave 11
05 execute operation
00 remote reset
01
FF perform operation
00
DF
6A
DESCRIPTION
Does not do anything.
Performs the same function as the front panel RESET key.
Initiates a waveform capture of trace memory and increments the "Total Number
of Trace Triggers" registers.
Performs the same function as the command in message A2 METERING / DEMAND
/ DEMAND DATA CLEAR / CLEAR MAXIMUM DEMAND DATA.
Performs the same function as the command in message A3 EVENT RECORDER /
EVENT DATA CLEAR / CLEAR EVENT RECORDER DATA.
Performs the same function as the command in message S1 745 SETUP /
INSTALLATION / CLEAR LOSS-OF-LIFE DATA.
Clears all trace memory buffers and sets the "Total Number of Trace Triggers"
register to zero.
Performs the same function as the command in message A2 METERING / ENERGY /
ENERGY DATA CLEAR / CLEAR ENERGY.
745 Transformer Management Relay
8.2 MODBUS PROTOCOL
8-7
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