Siemens S7200 与 S7300以太网通讯

QUESTION:

How do I configure an S7 connection for data communication between an S7-200 and an S7-300 via Ethernet?

ANSWER:

The configuration of an S7 connection between an S7-200 and an S7-300 via Ethernet has to be done on the one hand in STEP 7 Micro/WIN with the Ethernet Wizard for the S7- 200 and on the other in NetPro for the S7-300. For the Ethernet communication between the two stations you need communication processors and CPUs that support S7 communication. In this entry we have explained all the settings required for the S7-200 and the S7-300 using a sample configuration with CPU 226, CP243-1, CPU 315-2DP and CP343-1.

Configuration of the CP243-1 using the Ethernet Wizard of STEP 7 Micro/WIN

1. Open STEP 7 Micro/WIN and then start the Ethernet Wizard via "Tools > Ethernet Wizard...".

Fig. 1: Starting the Ethernet Wizard

2. In the first step of the Wizard is a description of the Ethernet Wizard. Click on "Next" to start

the configuration process.

Fig. 2: Description of the Ethernet Wizard

3. In the window that is displayed you are informed that your STEP 7 Micro/WIN project must be

compiled and be in Symbolic Addressing mode. Acknowledge the message with "Yes".

Fig. 3: Compiling the project and enabling the Symbolic Addressing mode

4. If you are connected with the CP243-1 in your S7-200 station, you can determine the module

position of the CP243-1 automatically via the "Read Modules" button. You can also enter the module position manually. Click on "Next".

Fig. 4: Determining the module position

5. Define a unique IP address for the CP243-1 and specify the associated subnetwork mask.

Acknowledge the settings with "Next".

Fig. 5: Defining the IP address and subnetwork mask for the CP243-1

6. In our example we need an S7 connection for communication to the S7-300. So, for "Number

of connections to configure for this module" you enter "1". Click on "Next".

Fig. 6: Number of S7 connections

7. The dialog for configuring the S7 connection opens. The S7 connection can be configured as

a client or server connection. In our example we have used a client connection for the data

transfer, i.e. the S7 connection is set up actively by the CP243-1.

?Enter the TSAP for connection identification between the two stations. The first part of the TSAP (xx.) is taken from 10 + connection number, and the second part (.xx) of the TSAP is taken from the rack number and the slot of the CP343-1.

In our example the TSAP is 10.07, i.e. the connection number = 0, the rack number = 0 and the slot of the CP= 7.

?Enter the IP address of the CP343-1.

?Specify a symbolic name for the connection.

Click on the "Data Transfers" button to define a new data transfer for this connection.

Fig. 7: Connection configuration

8. In order to read data from the S7-300 you select "Read data from the remote server

connection". Enter the number of data bytes to be read from the server and specify where this data is located in the S7-300. Define a storage area in the S7-200 for the data read. Assign a symbolic name for the data transfer. Acknowledge the settings with "OK".

Fig. 8: Configuring the data transfer

9. Since the configuration of the CP243-1 module may no longer be changed, you select the

setting with CRC protection. You can specify the Keep Alive Interval with the default time.

Click on "Next".

Fig. 9: CRC protection and Keep Alive Interval

10. Select a free address area for storing the configuration.

Fig. 10: Selecting a storage area for the configuration

11. Close the Ethernet Wizard with "Finish". The Ethernet Wizard generates the project

components required.

Fig. 11: Closing the Ethernet Wizard

12. In the main program ("MAIN (OB1)") you add the call of the ETH0_CTRL (communication

setup) and the call of the ETH0_XFR (read data packages). The parameters "Chan_ID" and "Data" of the ETH0_XFR block can be selected with a right-click.

Fig. 12: Adding the program code in the main program

13. Save the configuration and load it in the S7 200.

Configuring an unspecified S7 connection in NetPro

1. Open your STEP 7 project with the configured SIMATIC S7-300 station and switch to NetPro

via "Options > Configure Network".

Fig. 13: Starting NetPro

2. Mark the CPU in the SIMATIC S7-300 station and create a connection via "Insert > New

Connection...".

Fig. 14: Inserting a new connection

3. Select an unspecified S7 connection as connection type.

Fig. 15: Creating an unspecified S7 connection

4. The Properties Dialog for the S7 connection opens. Remove the check mark for "Establish an

active connection", because the connection is set up by the S7-200. For the partner address you enter the IP address of the S7-200. Then click on "Address Details...".

Fig. 16: Properties of the S7 connection

5. The partner TSAP settings must match the local settings in Fig. 7. However, the local TSAP is

calculated differently than for the S7-200. Local TSAP = 10 + Connection Number . Rack

Number + Slot of the CPU. The correct TSAP in this mask is therefore 10.02.

Fig. 17: Specification of the address details

6. Save and compile the configuration. Then download the complete S7-300 station from NetPro.

7. Switch to the block folder. Create DB11 with a sufficient data length, because this contains the

data for the communication (Fig. 8). Download this also into the controller.

8. Configuration is now completed.

You can now monitor the Receive data area (here: VB1000) online via the status table in STEP 7 Micro/WIN and check whether a data transfer is being made.