From online search, the following output was captured:

AI Overview

Based on search results for "HMI MTB1000", it appears you are referring to a Siemens HMI device, possibly a Basic Panel. With the introduction of TIA Portal version 17, Siemens implemented "Security-By-Default," which enables secure, TLS-based communication for HMI and PLC connections.

Securing communication with TLS

To establish basic, secure TLS communication between your HMI and a Siemens PLC, you need to use TIA Portal version 17 or higher and follow these steps:

Prerequisites

• You must be using TIA Portal version 17 or higher. Secure communication is the default for controllers with firmware V2.9 or newer.
• Both the PLC and HMI need to be part of the same TIA Portal project.
• You must create and manage security certificates for both the HMI and the PLC.

Step 1: Enable secure communication

1. In your TIA Portal project, go to the Device configuration for your PLC.
2. Navigate to the Properties and select Protection & Security.
3. In the Connection mechanisms section, check the box for "Permit only secure PG/PC and HMI communication".
4. Ensure that the PLC's hardware is compiled and downloaded before the HMI's hardware to guarantee the correct TLS certificate is created and installed.

Step 2: Configure HMI communication

1. In the same project, go to the Device configuration for your HMI.
2. Navigate to Properties and select Protection & Security.
3. Ensure the communication settings are configured to use secure channels, especially if you are using older project versions.
4. Specify a certificate for the HMI communication. TIA Portal allows you to create new certificates or use existing ones.

Step 3: Manage security certificates

1. For the PLC: Under the PLC's Protection & Security settings, you can manage the certificates for PLC communication. You can create or renew the certificates for the CPU.
2. For the HMI: In the HMI's Protection & Security settings, ensure it is configured to trust the PLC's certificate. The HMI will automatically check the validity of the PLC's certificate when a connection is established.
   
   

Step 4: Time synchronization

For the TLS connection to work correctly, the system time on both the PLC and the HMI must be within the valid date range of the TLS certificate. If the devices are in a remote location, you may need to increase the default 15-year validity period of the certificates.

How TLS communication works

• Initial connection: When the HMI initiates a connection to the PLC, the PLC sends its TLS certificate to the HMI.
• Authentication: The HMI checks if it trusts the PLC's certificate. If it does, a secure connection is established.
• Ongoing communication: For the duration of the session, all data exchanged between the HMI and PLC is encrypted using the TLS protocol, ensuring confidentiality and integrity.

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Disclaimer:The specific steps for secure communication can vary depending on the exact model of your HMI (e.g., Basic Panel, Comfort Panel) and the version of TIA Portal you are using. Always refer to the official Siemens documentation in the TIA Portal Information System for the most accurate and up-to-date instructions for your specific hardware and software versions.

Perhaps this will help get things communicating? 

SeanJohnYoung

Did you come right with this I am having the same issue communicating from G2 S7 1200 DC/DC/RLY to MTB1000 basic.