Chapter 4

Page 17 of 36

Chapter 4 – Operation

Setting Up the Inverter for Ethernet Network Operation

Once the SJ-EN board has been properly configured and connected to a network as described in Chapter 3, it is
capable of reading data from and writing data to the inverter. However if it is desired to have either the RUN
command and/or the speed reference come from the Ethernet master, you must change two inverter parameters
as shown in the following table.
Defaults
Function
Code Name Description
Run
Mode
Edit
Lo Hi –FE
(EU) –FU
(US) –FR
(Jpn)
Setting for Ethernet Control
A001 Frequency
Source
Setting
Six options; select codes:
00 Keypad potentiometer
01Control terminal
02 Function F001 setting
03 RS485 serial command
04 Expansion board 1
05 Expansion board 2
8 801 01 01 02
A002 Run
command
source setting
Five options; select codes:
01 Input terminal [FW] or [RV]
(assignable)
02 Run key on keypad, or
digital operator
03 RS485 serial command
04 Start/Stop, expansion card #1
05 Start/Stop, expansion card #2
8 801 01 01 02

Supported MODBUS Functions

The SJ-EN is implemented with the MODBUS/TCP communication protocol. It supports the following
MODBUS functions:
• READ MULTIPLE REGISTERS (03) – This function reads the contents of a contiguous block
of holding registers in the inverter.
• READ INPUT REGISTERS (04) – This function reads from 1 to up to around 125 contiguous
input registers in the inverter.
• WRITE SINGLE REGISTER (06) – This function will write to a single holding register in the
inverter.
• WRITE MULTIPLE REGISTERS (16) – This function will write to a block of contiguous
registers in the inverter.
Additional MODBUS/TCP protocol details, including specifications, application information, implementation
guides, and other resources are available from the web site www.modbus.org.