How to use DASSIDirect DAServer Together with Siemens S7-200 PLC?


This technote will go over the steps necessary to setup communication between the new DASSIDirect DAServer and a Siemens S7-200 PLC.

The TechNote consists of 4 parts:

Configure the S7-200 PLC
  • Configure the DAServer
  • Test the Communication
  • Memory Areas in the S7-200 PLCs and How to Access Them Via
Configure the S7-200 PLC
  1. Start Step7-Micro/Win 32. Create a new project or load
    your existing one (Figure 1 below):

    Figure 1: Step 7 - Micro/WIN32 - Project1 Dialog Box

  2. Click on Tools and then select Ethernet Wizard.
  3. Step through the wizard:

    Figure 2: Ethernet Wizard
  4. Click Yes when asked to use symbolic addressing. Otherwise the wizard
    cannot continue:

    Figure 3: Click Yes

  5. Enter the module position of the CP243-1.
    If you are uncertain about the position, click the button Read Modules.
    Otherwise you can enter the number directly:

    Figure 4: Specify Module Position Dialog Box
  6. Enter the IP configuration of your CP243-1.
    Especially during the startup phase of the project, I would recommend not
    to use a BOOTP server.
    Let the module detect the connection type (Figure 5 below):

    Figure 5: Module Address Configuration
  7. Enter the numbers of connections you want to configure for the CP243-1
    Default value is 0, which would not allow communication. In this example
    I will use 2 connections (Figure 6 below):

    Figure 6: 2 Connections
    Now you have to configure the connections. Connection 0 (Figure 7 below) will
    accept all incoming client requests:

    Figure 7: Connection Configuration
  8. Always select This is a Server Connection. I recommend using the
    default TSAP's as suggested by Step7-Micro/Win32.
  9. Click Next Connection (or Prev. Connection if available)
    to step through all the connections to configure them.
    Note: If you plan to use such a connection, be sure that only one client
    tries to connect to the PLC via this connection at the same time. All other
    connection tries will be rejected.
    Connection 1 accepts only requests from the specified client:

    Figure 8: Specified Client Requests
  10. If all connections are configured click OK.
    During the startup phase of a project I would recommend not to use a CRC protection:

    Figure 9: No CRC Protection

    The wizard now needs a range in the V-Memory where to store this information.
    Step7-Micro/Win32 will suggest a valid range.
  11. Click on Suggest Address if you have planned to use this range for
    something else.
    In this case Step7-Micro/Win32 will suggest another free range that has the
    correct size to hold this data:

    Figure 10: Store Memory Allocation for Address
  12. Click Next.
    The program now has enough information:

    Figure 11: Generate Project Components
  13. Click Finish to complete the configuration:

    Figure 12: Complete the Wizard Configuration
  14. Click Yes.
    In Step7-Micro/Win32 you should now see something like the following

    Figure 13: Step7_Micro/Win32 Window
    Step7-Micro/Win32 has created some new entries in the V-Memory, starting at
    the address as specified during the setup of the CP243-1.
  15. Download the configuration to the PLC:

    Figure 14: Download the Configuration
  16. Select all options and click OK (Figure 15 below):

    Figure 15: Download Options
  17. Set the PLC to STOP mode in order to be able to download a new configuration:

    Figure 16: PLC STOP Mode
  18. After the download don't forget to set the PLC to RUN mode again.
    This will not be done automatically:

    Figure 17: PLC RUN Mode

The PLC side is now configured.

Configure the DAServer

Configuration of the DAServer is quite easy.

Since we have created two connections in the PLC, we will also create two connections
in DASSIDirect DAServer. Connection 0 will correspond to the connection as created in Figure

Figure 18: DASSIDirect Connection 0

The Remote TSAP in DASSIDirect must be the Local TSAP in the PLC configuration,
and vice versa.

Connection 1 shown in Figure 19 (below) will correspond to the connection
as created in Figure 8:

Figure 19: DASSIDirect Connection 1

The single parts of the remote TSAPs in DASSIDirect are called Remote Rack
, Remote Slot No and Connection Resource. This naming convention
was meant for S7-300 and S7-400 PLC's.

For S7-200 PLC's it is a little bit different. The Remote Slot No (which
is the remote slot number of the CP, not the CPU) in the DASSIDirect configuration
corresponds to the Module Position as seen in Figure 4.
The Remote Rack No should always be 0.

Another way to figure out the correct values for the remote TSAP's in DASSIDirect
is described in the following information:

Figure 20 (below) shows you how to figure out the meaning of the single parts
of the remote TSAP in DASSIDirect from a local TSAP configuration in the PLC
as seen in Figure 7 or Figure 8 (The TSAP
in Figure 20 do not correspond to the TSAP's as used in the above example. I
wanted to have different numbers for Rack and Slot in Figure 20!).

Figure 20: Remote TSAP

The TSAP in Figure 20 would correspond to the remote TSAP value in Figure
7 or Figure 8.

In this example the value for Connection Resource in DASSIDirect would
be 02, the value for the Remote Rack No would be 0 and
the Remote Slot No would be 3.

Now create your device group(s), if necessary.

For a DDE/SuiteLink connection you need to have at least one device group per
connection, for OPC it is not necessary. For to test the communication as described
below, please enter a device group called S7200.

The connection between DASSIDirect and the S7-200 PLC should now be ready to

Test the Communication

In previous TechNotes we used wwclient for testing. This tool will no
longer be installed when installing ArchestrA (A²) products like InTouch
8.0 or any DAServer. If you have InTouch 7.11 installed you will find this tool
under Program Files/Wonderware FactorySuite/Common and you can use this

  1. Create a simple InTouch application with one tag.
  2. Select Special/Access Names from the main menu.
  3. Select Add.
    The Add Access Name dialog box appears:

    Figure 21: Add Access Name
  4. Enter a meaningful name in the Access field.
  5. Leave the Node Name blank if you have InTouch and DASSIDirect on
    the same node.
    Otherwise enter the nodename of the PC where DASSIDirect resides.
    The Topic Name must match the Device Group name as configured
    in DASSIDirect.
  6. Select Special/Tagname Dictionary and select New.

    Figure 22: New Tagname
  7. Select Type: I/O Integer and the access name as created in the previous
  8. Use the item MB1 because it always exists in all S7-200 PLCs.
    Use this tag in the window you just created.
  9. Activate DASSIDirect in the System Management Console (SMC).
  10. Start WindowViewer™.
  11. Open the Diagnostic in the SMC to verify the communication:

    Figure 23: Check Communication from the SMC
    If you see a Time value that is changing, and a Client Quality
    of 00C0, your communication is fine.

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