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CHAPTER 3: MODBUS FUNCTIONS FUNCTION CODE 06H: STORE SINGLE SETPOINT

750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE 3 - 5

Function Code 06H: Store Single Setpoint

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.

Function Code 10H: Store Multiple Setpoints

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 Bytes Example Description

Slave Address 1 11 message for slave 11

Function Code 1 06 store single setpoint

Data Starting Address 2 11 00 data starting at 1100h

Data 2 00 C8 data for address 1100h

CRC (low, high) 2 8F F0 computed CRC error code

Slave Response Bytes Example Description

Slave Address 1 11 message from slave 11

Function Code 1 06 store single setpoint value

Data Starting Address 2 11 00 data starting at 1100h

Data 2 00 C8 data for address 1100h

CRC (low, high) 2 8F F0 computed CRC error code

Master Transmission Bytes Example Description

Slave Address 1 11 message for slave 11

Function Code 1 10 store multiple setpoint value

Data Starting Address 2 11 00 data starting at 1100h

Number of Setpoints 2 00 02 2 setpoints = 4 bytes total

Byte Count 1 04 4 bytes of data

Data #1 2 00 C8 data for address 1100h

Data #2 2 00 01 data for address 1101h

CRC (low, high) 2 27 01 computed CRC error code

Slave Response Bytes Example Description

Slave Address 1 11 message from slave 11

Function Code 1 10 store multiple setpoint value

GE 750 Guide

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