ProSoft Technology MVI69L-MBS - Manual (Page 122)

Reference MVI69L-MBS ♦ CompactLogix Platform
User Manual Communication Module
Page 122 of 154 ProSoft Technology, Inc.
January 6, 2014
Func Code - Tells the Master to read the register values from the Slave. FC3.
Addr in Dev - Tells the Master where in the Slave's database to obtain the data.
In the above example, the Master's Modbus command to transmit inside the
Modbus packet is as follows.
Slave address Function Code Address in Device Reg count
DEC 01 3 6100 2
HEX 01 03 17 D4 00 02
In the above example the (Enron/Daniel supporting) Slave's Modbus command to
transmit inside the Modbus packet is as follows.
Slave address Function Code Byte Count Data
DEC 01 3 8 32.75 275.69
HEX 01 03 08 00 00 42 03 D8 52 43 89
In the above example the (a NON-Enron/Daniel supporting) Slave's Modbus
command that is transmitted inside the Modbus packet is as follows.
Slave address Function Code Byte Count Data
DEC 01 3 4 32.75
HEX 01 03 04 00 00 42 03