Store Multiple Settings (Function Code 10H; Exception Responses - GE UR Series B30 Instruction Manual

B.2 MODBUS FUNCTION CODES
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
B
device 11h (17 decimal).
Table B–8: MASTER AND SLAVE DEVICE PACKET TRANSMISSION EXAMPLE
MASTER TRANSMISSION
PACKET FORMAT
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS - hi
DATA STARTING ADDRESS - lo
NUMBER OF SETTINGS - hi
NUMBER OF SETTINGS - lo
BYTE COUNT
DATA #1 - high order byte
DATA #1 - low order byte
DATA #2 - high order byte
DATA #2 - low order byte
CRC - low order byte
CRC - high order byte
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–9: MASTER AND SLAVE DEVICE PACKET TRANSMISSION EXAMPLE
MASTER TRANSMISSION
PACKET FORMAT
SLAVE ADDRESS
FUNCTION CODE
CRC - low order byte
CRC - high order byte
B-6
B.2.5 STORE MULTIPLE SETTINGS (FUNCTION CODE 10H)
SLAVE RESPONSE
EXAMPLE (HEX) PACKET FORMAT
11 SLAVE ADDRESS
10 FUNCTION CODE
40 DATA STARTING ADDRESS - hi
51 DATA STARTING ADDRESS - lo
00 NUMBER OF SETTINGS - hi
02 NUMBER OF SETTINGS - lo
04 CRC - lo
00 CRC - hi
C8
00
01
12
62
SLAVE RESPONSE
EXAMPLE (HEX) PACKET FORMAT
11 SLAVE ADDRESS
39 FUNCTION CODE
CD ERROR CODE
F2 CRC - low order byte
CRC - high order byte
B30 Bus Differential System
APPENDIX B
EXAMPLE (HEX)
11
10
40
51
00
02
07
64
B.2.6 EXCEPTION RESPONSES
EXAMPLE (HEX)
11
B9
01
93
95
GE Multilin