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B-6
B90 Low Impedance Bus Differential System
GE Multilin
B.2 MODBUS FUNCTION CODES
APPENDIX B
B
B.2.5 STORE MULTIPLE SETTINGS (FUNCTION CODE 10H)
This function code allows the master to modify the contents of a one or more consecutive setting registers in a relay. Setting
registers are 16-bit (two byte) values transmitted high order byte first. The maximum number of setting registers that can be
stored in a single packet is 60. The following table shows the format of the master and slave packets in Modbus RTU. Mod-
bus TCP/IP ADUs have a MBAP instead of slave address, and CRC is in another stack layer. The example shows a master
device storing the value 200 at memory map address 4051h, and the value 1 at memory map address 4052h to slave
device 11h (17 decimal).
B.2.6 EXCEPTION RESPONSES
Programming or operation errors usually happen because of illegal data in a packet. These errors result in an exception
response from the slave. The slave detecting one of these errors sends a response packet to the master with the high order
bit of the function code set to 1.
The following table shows the format of the master and slave packets in Modbus RTU. Modbus TCP/IP ADUs have a
MBAP instead of slave address, and CRC is in another stack layer. The example shows a master device sending the
unsupported function code 39h to slave device 11h.
Table B–8: MASTER AND SLAVE DEVICE PACKET TRANSMISSION EXAMPLE
MASTER TRANSMISSION
SLAVE RESPONSE
PACKET FORMAT
EXAMPLE (HEX)
PACKET FORMAT
EXAMPLE (HEX)
SLAVE ADDRESS
11
SLAVE ADDRESS
11
FUNCTION CODE
10
FUNCTION CODE
10
DATA STARTING ADDRESS - hi
40
DATA STARTING ADDRESS - hi
40
DATA STARTING ADDRESS - lo
51
DATA STARTING ADDRESS - lo
51
NUMBER OF SETTINGS - hi
00
NUMBER OF SETTINGS - hi
00
NUMBER OF SETTINGS - lo
02
NUMBER OF SETTINGS - lo
02
BYTE COUNT
04
CRC - lo
07
DATA #1 - high order byte
00
CRC - hi
64
DATA #1 - low order byte
C8
DATA #2 - high order byte
00
DATA #2 - low order byte
01
CRC - low order byte
12
CRC - high order byte
62
Table B–9: MASTER AND SLAVE DEVICE PACKET TRANSMISSION EXAMPLE
MASTER TRANSMISSION
SLAVE RESPONSE
PACKET FORMAT
EXAMPLE (HEX)
PACKET FORMAT
EXAMPLE (HEX)
SLAVE ADDRESS
11
SLAVE ADDRESS
11
FUNCTION CODE
39
FUNCTION CODE
B9
CRC - low order byte
CD
ERROR CODE
01
CRC - high order byte
F2
CRC - low order byte
93
CRC - high order byte
95
Summary of Contents for B90
Page 10: ...x B90 Low Impedance Bus Differential System GE Multilin TABLE OF CONTENTS ...
Page 284: ...5 166 B90 Low Impedance Bus Differential System GE Multilin 5 8 TESTING 5 SETTINGS 5 ...
Page 334: ...10 8 B90 Low Impedance Bus Differential System GE Multilin 10 2 BATTERIES 10 MAINTENANCE 10 ...
Page 338: ...A 4 B90 Low Impedance Bus Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 460: ...C 30 B90 Low Impedance Bus Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 476: ...E 10 B90 Low Impedance Bus Differential System GE Multilin E 1 IEC 60870 5 104 APPENDIX E E ...
Page 502: ...viii B90 Low Impedance Bus Differential System GE Multilin INDEX ...