How to Protect Siemens PLC using Password?

Every industry uses PLC’s to measure and control different process parameters in the plant. PLC configuration and programming access will be limited to a few engineers in the plant.

If an unauthorized person with less knowledge over PLC’s get access to the system and unknowingly may damage or creates problems with the healthy logics.

So, it is best practice to protect PLC by using a password. We know that we can upload and download the program from and to PLC.

We can password protect both the downloading and uploading, so a person with authentication can only work with plc programming.

Protect Siemens PLC using Password

Below I have explained the method to protect plc using the password.

To create a password, follow the below steps,

  1. Select PLC and right-click on it.
  2. Click on “Properties”.
How to Protect Siemens PLC using Password

3. A new window will appear, as shown in the below figure.

Siemens PLC Write Protection

4. Here we will get two options, listed below.

  1. Write protection and
  2. Write/read protection.

5. In Write protection, we can create password protection while downloading the program to PLC.

While downloading the program, it will ask for a password and a person with authentication can only use it.

Siemens PLC Password

6. Another option, write/read protection, by using this option we can password protect for both uploading and downloading of the program from PLC to PC and vice-versa.

Author: Suhel Patel

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