Siemens SIMATIC ET 200SP Function Manual

Open User Communication
6.4 Open User Communication with addressing via domain names
Communication
74 Function Manual, 11/2019, A5E03735815-AH
Setting up a TCP connection via the domain name of the communication partner
For TCP communication via the domain name you need to create a data block with the
TCON_QDN system data type yourself, assign parameters and call it directly at the
instruction. The TCON, TSEND_C and TRCV_C instructions support the system data type
TCON_QDN:
To set up a TCP connection via the domain name of the communication partner, follow these
steps:
1. Create a global data block in the project tree.
2. Define a tag of the data type TCON_QDN in the global data block.
The example below shows the global data block "Data_block_1" in which the tag
"DNS Connection1" of data type TCON_QDN is defined.
Figure 6-2 Data type TCON_QDN
3. Program the parameters of the TCP connection (for example the fully qualified domain
name (FQDN)) in the tag of data type TCON_QDN.
4. Create a TCON instruction in the program editor.
5. Interconnect the CONNECT parameter of the TCON instruction with the tag of the data
type TCON_QDN.
In the example below, the CONNECT parameter of the TCON instruction is
interconnected with the tag "DNS connection1" (data type TCON_QDN).
Figure 6-3 TCON instruction

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