B.2.3 Execute Operation (Function Code 05H) - GE N60 Instruction Manual

B.2 MODBUS FUNCTION CODES
This function code allows the master to perform various operations in the relay. Available operations are shown in the Sum-
mary of operation codes table below.
The following table shows the format of the master and slave packets. The example shows a master device requesting the
slave device 11h (17 decimal) to perform a reset. The high and low code value bytes always have the values "FF" and "00"
respectively and are a remnant of the original Modbus definition of this function code.
B
Table B–4: MASTER AND SLAVE DEVICE PACKET TRANSMISSION EXAMPLE
MASTER TRANSMISSION
PACKET FORMAT
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE - high
OPERATION CODE - low
CODE VALUE - high
CODE VALUE - low
CRC - low
CRC - high
Table B–5: SUMMARY OF OPERATION CODES FOR FUNCTION 05H
OPERATION DEFINITION
CODE (HEX)
0000 NO OPERATION
0001 RESET
0005 CLEAR EVENT RECORDS
0006 CLEAR OSCILLOGRAPHY
1000 to 103F VIRTUAL IN 1 to 64 ON/OFF
This function code allows the master to modify the contents of a single setting register in an relay. Setting registers are
always 16 bit (two byte) values transmitted high order byte first. The following table shows the format of the master and
slave packets. The example shows a master device storing the value 200 at memory map address 4051h to slave device
11h (17 dec).
Table B–6: MASTER AND SLAVE DEVICE PACKET TRANSMISSION EXAMPLE
MASTER TRANSMISSION
PACKET FORMAT
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS - high
DATA STARTING ADDRESS - low
DATA - high
DATA - low
CRC - low
CRC - high
B-4
EXAMPLE (HEX)
11
05
00
01
FF
00
DF
6A
DESCRIPTION
Does not do anything.
Performs the same function as the
Performs the same function as the
command.
Clears all oscillography records.
Sets the states of Virtual Inputs 1 to 64 either "ON" or "OFF".
EXAMPLE (HEX)
11
06
40
51
00
C8
CE
DD
N60 Network Stability and Synchrophasor Measurement System

B.2.3 EXECUTE OPERATION (FUNCTION CODE 05H)

SLAVE RESPONSE
PACKET FORMAT
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE - high
OPERATION CODE - low
CODE VALUE - high
CODE VALUE - low
CRC - low
CRC - high
faceplate
faceplate
B.2.4 STORE SINGLE SETTING (FUNCTION CODE 06H)
SLAVE RESPONSE
PACKET FORMAT
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS - high
DATA STARTING ADDRESS - low
DATA - high
DATA - low
CRC - low
CRC - high
APPENDIX B
EXAMPLE (HEX)
11
05
00
01
FF
00
DF
6A
RESET key.
menu
CLEAR EVENT RECORDS
EXAMPLE (HEX)
11
06
40
51
00
C8
CE
DD
GE Multilin