Communications services
3.6 Secure Communication
Communication
40
Function Manual, 05/2021, A5E03735815-AJ
3.6
Secure Communication
3.6.1
Basics of Secure Communication
3.6.1.1
Basics of Secure Communication
For STEP 7 (TIA Portal) as of V14 and for S7-1500 CPUs as of firmware V2.0, the options for
secure communication have been broadened considerably.
"S7-1500 CPUs" also refers to CPU versions S7-1500F, S7-1500T, S7-1500C as well as
S7-1500pro CPUs and ET200SP CPUs.
In subsequent versions, additional components will support Secure Communication (secure
OUC), see next section.
As of firmware Version V4.4, S7-1200 CPUs also support Secure Communication (Secure
OUC).
Requirement
•
CPUs that support connection description DBs with the structure of the SDT
TCON_IP_V4_SEC or SDT TCON_QDN_SEC. These are the following CPUs:
–
S7-1200 as of firmware V4.4
–
S7-1500 as of firmware V2.0
•
Also optional via the following CPs:
–
CP 1243-1 as of firmware V3.2
–
CP 1243-8 IRC as of firmware V3.2
–
CP 1543-1 as of firmware V2.0
–
CP 1545-1
–
CP 1543SP-1
Secure Communication via CP 1242-7 GPRS V2 is not possible.
Public Key Infrastructure (PKI)
The attribute "secure" is used for the identification of communication mechanisms that are
based on a Public Key Infrastructure (PKI) (for example RFC 5280 for Internet X.509 Public
Key Infrastructure Certificate and Certificate Revocation List Profile). A Public Key
Infrastructure (PKI) is a system that can issue, distribute and check digital certificates. The
digital certificates issued are used in the PKI to secure computer-based communication. If a
PKI uses asymmetric key cryptography, the messages in a network can be digitally signed and
encrypted.
Components that you have configured in STEP 7 (TIA Portal) for secure communication use
an asymmetric key encryption scheme with a public key (Public Key) and a private key
(Private Key). TLS (Transport Layer Security) is used as the encryption protocol. TLS is the
successor for the SSL (Secure Sockets Layer) protocol.
Summary of Contents for SIMATIC ET 200AL
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