Inverter communication by CC-link IE Field basic or RS485

Inverter communication by CC-link IE Field basic or RS485

The article provides information on inverter communication via CC-Link IE Field Basic and on RS485 parameterization
This project contains information about communicating inverter by CC-Link IE Field Basic and parameterization of RS485

Communication

Set the basic parameters that allow communication in the CC-Link IE Field Basic network. The basic parameters are listed in the table below.

Parameter No.

Parameter name

Value

Pr. 79

Operation mode selection

6

Pr. 340

Communication startup mode selection

10

Pr. 544

CC-Link extended setting

18

Pr. 550

NET mode operation command source selection

5

Pr. 1427

Ethernet function selection 1

61450

You should also remember to set the IP address, as well as the subnet mask:


Also, specify the range of IP addresses that will be able to control the inverter:


Parameterization RS485

The first step is to determine what communication parameters are selected in the master, i.e. in our case in the PLC. Depending on the driver, this is done in two different ways (GX Works2: FX3S, FX3G or GX Works3: FX5).

       1.         Reading of communication parameters in GX Works 2 (FX3_)


We open the project and in the Navigation tree select: Parameter-> PLC Parameter


In the newly opened window, go to the tab PLC System(2):


Here we have the parameters of our communication. We select the data we are interested in from it:


Name

Value from the screen

Description

Communication speed

38400

Speed of communication

Data Length

8Bit

Length of the data fram in one communication 

Stop bit

2Bit

Number of stop bits

Parity

Even

Parity of data transmission

Protocol

Non-protocol

Means Mitsubishi Inverter Protocol



2.       Reading communication parameters in GX Works 3 (FX5_):

We open the project and in the Navigation tree we go to the field: Parameter -> FX5UCPU-> Module Parameter -> 485 Serial Port.





In the open tab, we will be able to read the data we are interested in:




Name

Value from the screen

Description

Communication speed

38400

Speed of communication

Data Length

---

Length of data frame in one communication cycle

Stop bit

1Bit

Number of stop bits

Parity

Odd

Parity of data transmission

Protocol

MODBUS RTU

Communication protocol


Attention:
When selecting  ModBus RTU protocol, the number of communication data is always set to  8Bit !!! This is due to the ModBus RTU protocol specification, therefore in the options  we cannot change this value.

3.       Parameter setting in the inverter:

As an example, we will take the data read from the GX Works 3 program, that is:

Name

Value from the screen

Description

Communication speed

38400

Speed of communication

Data Length

---

With the ModBus RTU protocol selected, this value is 8 bit

Stop bit

1Bit

Number of stop bits

Parity

Odd

Parity of data transmission

Protocol

MODBUS RTU

Communication protocol

Now set the inverter parameter values:

Parameter

Description

Example value

117

Station number ( individual for each inverter)

Range 0-31

---

118

Communication Speed:

Possibilities:

48 – 4800

96 – 9600

192 – 19200

384 – 38400

576 – 57600

768 – 76800

1152 – 115200

384

119

DataLength or stopbit:

0 – 8Bit/1StopBit

1 – 8Bit/2StopBit

10 – 7Bit/1StopBit

11 – 7Bit/2StopBit

0

120

Parity

0 – None

1 – Odd

2 – Even

1

121-123

TimeOut of communication, number of connection attempts,etc.

9999

549

Communication protocol:

0 – Mitsubishi Inverter Protocol

1 – ModBus RTU

1