Configuration, programming
4.1 Security recommendations
CP 1543-1
32 Operating Instructions, 05/2017, C79000-G8976-C289-07
Security functions of the product
Use the options for security settings in the configuration of the product. These includes
among others:
● Protection levels
Configure access to the CPU under "Protection and Security".
● Security function of the communication
– Enable the security functions of the CP and set up the firewall.
If you connect to public networks, you should use the firewall. Think about the services
you want to allow access to the station via public networks. By using the "bandwidth
restriction" of the firewall, you can restrict the possibility of flooding and DoS attacks.
The FETCH/WRITE functionality allows you to access any data of your PLC. The
FETCH/WRITE functionality should not be used in conjunction with public networks.
– Use the secure protocol variants HTTPS, FTPS, NTP (secure) and SNMPv3.
– Use the program blocks for secure OUC communication (Secure OUC).
– Leave access to the Web server of the CPU (CPU configuration) and to the Web
server of the CP disabled.
● Protection of the passwords for access to program blocks
Protect the passwords stored in data blocks for the program blocks from being viewed.
You will find information on the procedure in the STEP 7 information system under the
keyword "Know-how protection".
● Logging function
Enable the function in the security configuration and check the logged events regularly for
unauthorized access.
● Define rules for the use of devices and assignment of passwords.
● Regularly update the passwords to increase security.
● Only use passwords with a high password strength. Avoid weak passwords for example
"password1", "123456789" or similar.
● Make sure that all passwords are protected and inaccessible to unauthorized personnel.
See also the preceding section for information on this.
● Do not use one password for different users and systems.
Protocols
Secure and non-secure protocols
● Only activate protocols that you require to use the system.
● Use secure protocols when access to the device is not prevented by physical protection
measures.
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