Open User Communication
6.11 Secure Open User Communication
Communication
106 Function Manual, 11/2019, A5E03735815-AH
6.11.5 Secure OUC with Modbus TCP
For secure Modbus TCP connection you need to create a data block with one of the system
data types TCON_IP_V4_SEC or TCON_QDN_SEC yourself, assign parameters and call it
directly at the MB_Server or MB_CLIENT instruction.
Requirements:
● S7-1500 CPU CPU firmware version V2.5 or higher
● The Modbus client (TLS client) can reach the Modbus server (TLS server) over IP
communication in the network.
● TLS client and TLS server have all the required certificates.
Example of setting up a secure Modbus TCP connection to a Modbus TCP server
The following section describes how you can set up a Secure Open User Communication
over Modbus TCP from a Modbus TCP client to a Modbus TCP server.
To set up a secure connection from a Modus TCP client (TLS client) to a Modbus TCP
server (TLS server) and set up the IPv4 address of the mail server, follow these steps:
1. Create a global data block in the project tree.
2. Define a tag of the data type TCON_IP_V4 SEC in the global data block.
Figure 6-25 TCON_IP_V4_SEC
3. Set the connection parameters of the TCP connection in the "Start value" column. Enter
the IPv4 address of the mail server, for example, for the "MailServerAddress".
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