Ladder setting for Melsec ethernet communication

Ethernet communication with MELSEC PLC must create TCP/IP ( or UDP/IP ) Ladder routime.

Note) This setting example mainly explains about AJ71E71/A1SJ71E71 communication module.

1. Concept of ethernet communication

<Figure 1> is concept of Melsec ethernet communication.

At <Figure 1>, = fixed buffer, maximum connection of master( computer ) = 8.

<Figure 1> Concept of Melsec ethernet communication

2. Setting of ethernet communication module

Setting of ethernet communication module are as follows :

2.1 DIP switch setting

<Figure 2> is DIP switch setting for AJ71E71 ethernet communication.

<Figure 2> DIP switch setting for AJ71E71 ethernet communication

2.2 Operation mode setting

<Figure 3> is DIP switch setting of operation mode.

( operation mode = always set to ‘0’ )

<Figure 3> DIP switch setting of operation mode

3. I/O signal and buffer memory address

<Table 1> is I/O signal between CPU and ethernet module. ( when the ethernet module installed at '0' slot )

<Table 2> is buffer memory address.

                                  <Table 1> I/O signal between CPU and ethernet module 

                                                                 <Table 2> Buffer memory address

4. Ladder setting example for Melsec ethernet communication

Ladder setting for Melsec ethernet communication are as follows :

4.1 Inital setting( when installed '0' slot )

<Figure 4> is example of inital setting when the ethernet module installed at '0' slot.

<Figure 4> Example of inital setting

4.2 Open setting for Port 1

<Figure 5> is example of open setting for Port 1 when the ethernet module installed at '0' slot.

<Figure 5> Example of open setting for Port 1

4.3 Close setting when an error occurs

<Figure 6> is example of close setting when an error occurs for the ethernet module installed at '0' slot. 

<Figure 6> Example of close setting when an error occurs

 

4.4 Open method of 2 or more Port

<Figure 7> is open method diagram of 2 or more Port. ( maximum port = 8 )

<Figure 7> Open method diagram of 2 or more Port