Function Code 06H: Store Single Setpoint; Function Code 10H: Store Multiple Setpoints - GE 750 Manual

CHAPTER 3: MODBUS FUNCTIONS

Function Code 06H: Store Single Setpoint

Function Code 10H: Store Multiple Setpoints

750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE
This function code allows the master to modify the contents of a single setpoint register in
a 750/760. Setpoint registers are always 16 bit (two byte) values transmitted high-order
byte first (see the section Modbus Memory Map on page 4-1 for details). The following table
shows the format of the master and slave packets. It shows a master device storing the
value 200 at memory map address 1100h to slave device 11.
Master Transmission
Slave Address
Function Code
Data Starting Address
Data
CRC (low, high)
Slave Response
Slave Address
Function Code
Data Starting Address
Data
CRC (low, high)
This function code allows the master to modify the contents of a one or more consecutive
setpoint registers in a 750/760. Setpoint registers are 16 bit (two byte) values transmitted
high-order byte first. The maximum number of setpoint registers that can be stored in a
single packet is 60. The table below shows the format of the master and slave packets. It
shows a master device storing the value 200 at memory map address 1100h, and the
value 1 at memory map address 1101h to slave device 11.
Master Transmission
Slave Address
Function Code
Data Starting Address
Number of Setpoints
Byte Count
Data #1
Data #2
CRC (low, high)
Slave Response
Slave Address
Function Code
FUNCTION CODE 06H: STORE SINGLE SETPOINT
Bytes Example
1 11 message for slave 11
1 06 store single setpoint
2 11 00 data starting at 1100h
2 00 C8 data for address 1100h
2 8F F0 computed CRC error code
Bytes Example
1 11 message from slave 11
1 06 store single setpoint value
2 11 00 data starting at 1100h
2 00 C8 data for address 1100h
2 8F F0 computed CRC error code
Bytes Example
1 11 message for slave 11
1 10 store multiple setpoint value
2 11 00 data starting at 1100h
2 00 02 2 setpoints = 4 bytes total
1 04 4 bytes of data
2 00 C8 data for address 1100h
2 00 01 data for address 1101h
2 27 01 computed CRC error code
Bytes Example
1 11 message from slave 11
1 10 store multiple setpoint value
Description
Description
Description
Description
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