Siemens SIMATIC ET 200SP Function Manual

Communications services
3.6 Secure Communication
Communication
Function Manual, 11/2019, A5E03735815-AH
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Course of the secure communication
The figure below shows, in simplified terms, how communication is established
("handshake") focusing on the negotiation of keys used for data exchange (here with HTTP
over TLS).
However, the course can be applied to all communication options that are based on the
usage of TLS, i.e. also for Secure Open User Communication (see Basics for secure
communication).
Figure 3-14 Handshake with https
The figure does not show the measures taken at Alice's end (browser) to verify the certificate
sent by the Web server. Whether Alice can trust the Web server certificate received and
therefore the identity of the Web server, and can accept the exchange of data, depends on
positive verification.

Siemens SIMATIC ET 200SP Specifications

General

System Type	Distributed I/O System
Mounting	DIN Rail
Communication Protocol	PROFINET, PROFIBUS
IP Rating	IP20
Category	I/O Systems
Supply Voltage	24 V DC
Modularity	Yes
Hot Swapping	Yes
Storage Temperature	-40°C to +70°C
Digital Inputs	Yes
Digital Outputs	Yes
Analog Inputs	Yes
Analog Outputs	Yes
Communication Interface	PROFINET, PROFIBUS
Number of Modules	Up to 64
Relative Humidity	5 to 95% (non-condensing)
Operating Temperature	-25°C to +60°C