S7-300, S7-400, S7-1200, S7-1500 & VIPA

S73&400 IO Server is dedicated to communicate directly with SIEMENS PLC (S7-300, S7-400 and S7-1200) but also VIPA PLC using either the MPI link or the Ethernet link (ISOTCP).

WARNING : eWON with MPI/Profibus interface is required to connect directly to the MPI/Profibus interface of the PLC.

Watch an example on how to configure a Siemens S7-300 or S7-400 for remote access. 

Routing Possibilities

From firmware 6.3 and up, eWON can reach devices on the MPI/Profibus networks behind the first connected network. It can access devices that make part of another MPI/Profibus network connected indirectly to the eWON through another (or various other) PLC. See "Advanced MPI/Profbus Routing" for further explications. 

Limitations

The eWON remote maintenance solution for the MPI and Profibus devices is based on the use of a transparent gateway between the ISOTCP and the MPI/Profibus protocols. This solution has the advantage that it is transparent for the Siemens software and the involved PLC. A drawback of this solution is that the Operator Panels cannot be accessed from remote on their MPI or Profibus interfaces, because the transparent gateway cannot be used for these devices. So to make a remote maintenance on an Operator Panel the Ethernet interface of the OP has to be used OR use eVCOM to make remote maintenance of Operator Panel.

Documents

Remote Access for Siemens S7-300&400 PLCs AUG-037.pdf
Access Siemens PLCs through an existing Talk2M connection AUG-040.pdf
Remote Access for Siemens S7-300&400 PLCs through TIA AUG-047.pdf
Polling Data Registers from Siemens PLCs AUG-048.pdf
eWON MPI - teleservice (Remote Access using PSTN connection) eWON2001_MPI-teleservice.pdf
eWON MPI - teleservice using eVCOM (Remote access using PSTN connection) eWON2001+eVCOM MPI-teleservice.pdf
Direct gateway MPI for Siemens PLC TN29 UK.pdf

Gateway files

eWON Gateway station file for STEP7®
Right click and select "Save targed as" to download the file on your PC
ewon.cfg
eWON Gateway station file for STEP7® (with WinCC installed)
Right click and select "Save targed as" to download the file on your PC
ewon_WinCC.cfg
eWON Gateway station library for TIA V11 eWON TIA_V11.zip
eWON Gateway station library for TIA V12 eWON_TIA_V12.zip
eWON Gateway station library for TIA V13eWON_TIA_V13.zip
eWON Gateway station library for TIA V14eWON_TIA_V14.zip
eWON Gateway station library for TIA V15eWON TIA V15.zip

S7-300 / 400 PLC

eWON typePollingRemote maintenanceTransmission rate
eWON 2005CD/ 4005CD with MPI on board

MPI: Yes

Profibus: Yes

Ethernet (ISOTCP): Yes

MPI: Yes

Profibus: Yes

Ethernet (ISOTCP): Yes2

19,2Kbps to 12 Mbps

19,2Kbps to 12 Mbps

N.A.

eWON 500/ 2001/ 2101/ 4001/ 4101 with MPI on board

MPI: Yes

Profibus: Yes for stand alone devices1

Ethernet (ISOTCP): Yes

MPI: Yes

Profibus: Yes for stand alone devices1

Ethernet (ISOTCP): Yes2

19,2Kbps to 1,5 Mbps

19,2Kbps to 1,5 Mbps

N.A.

eWON with serial interface (no MPI on board)

MPI: No

Profibus: No

Ethernet (ISOTCP): Yes

 MPI: No

Profibus: No

Ethernet (ISOTCP): Yes2

-

-

N.A.

Notes :

  • 1 A brief disturbance on the Profibus network can be caused by this eWON model when switching on/off. For a stand-alone device, this is not a problem. But if the Profibus network is used for intercommunication between Profibus Master and Slave devices, then the Siemens CPU might change into STOP mode if the network errors are not handled inside the CPU program (OB85 & OB86).
  • 2 For remote maintenance over the Internet, an eWON with VPN capabilities must be used to allow a complete remote maintenance of the PLC.

S7-1200 / 1500

The Siemens S7-1200 PLC is an Ethernet only PLC that is fully compatible with eWON.

Polling will be done with any eWON type (no need of a MPI port) through ISOTCP protocol from the S73&400 IOServer.

As the remote maintenance is done through Ethernet, the eWON will be used as a standard Ethernet router.

Data Polling

To poll data on the S7-1200, use the S73&400 IOServer and configure your Topic to ISOTCP (see picture):

Note that the TSAP must be equal to 03.01

On S7-1200, you will be able to poll Input (I), Output (Q), Internal Memory (M) and data blocks (DB). Timer and counter are not available because they are addressed as an instance data block in the PLC. 


It is important to release the access to the PLC. Therefore you need to go into the TIA Portal and release the “PUT/GET communication.

! DO NOT FORGET TO CHECK WHETHER THE BELOW OPTION IS CHECKED IN TIA PLC Program !!

If not checked, error such as "S74srv-Invalid DataType in read response" might occur.