Modbus Functions; Supported Modbus Function Codes - GE 750 Manual

GE
Grid Solutions
750/760 Feeder Management Relay
Chapter 3: Modbus Functions

Supported Modbus Function Codes

750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE

Modbus Functions

Modbus officially defines function codes from 1 to 127 though only a small subset is
generally needed. The 750/760 relays support some of these functions, as summarized
below. Subsequent sections describe each function code in detail.
Table 1: GE Multilin Modbus Function Codes
Code Definition
Hex Dec
01 1
Read Binary Status
02 2
03 3
Read Actual Values
Or Setpoints
04 4
05 5 Execute Operation
Store Single
06 6
Setpoint
Store Multiple
10 16
Setpoints
Description
Read one or more consecutive
binary status bits from the 750/760.
Read actual value or setpoint
registers from one or more
consecutive memory map register
addresses.
Perform 750/760 specific
operations.
Write a specific value into a single
setpoint register.
Write specific values into one or
more consecutive setpoint registers.
Substitute
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04h
03h
10h
10h
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