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• Open TCP/IP communication
Open TCP/IP communication provides a program interface for the transfer of connection-
oriented and connectionless services. The establishment and termination of connections is
initiated here only via the "dynamic" program interface.
STEP 7 provides a UDT for the connection parameter assignment as well as four FBs for
high-speed data exchange.
The CP supports communication via ISO-on-TCP connections for this interface.
Interfaces used and communications services
The following table provides an overview of the services available at the interfaces.
Communications service
S7 communication
Open communications
services using
SEND/RECEIVE
interface
Open TCP/IP
communication
Time of day
H connections
1.3
Network topology with redundancy (PRP)
Redundant Network Access (RNA)
In Siemens Industry, Redundant Network Access (RNA) stands for devices and software that
support the redundancy protocol "Parallel Redundancy Protocol" (PRP). RNA allows the
connection of devices to redundant Ethernet network structures.
The product names of the RNA devices end with "RNA".
Some devices of the SCALANCE X-200RNA product line also support the redundancy protocol
"High-availability Seamless Redundancy" (HSR).
CP 442-1 RNA
Equipment Manual, 03/2022, C79000-G8976-C318-05
PG functions; operator control and monitoring
functions (ISO)
PG functions; operator control and monitoring
functions (ISO-on-TCP)
Data exchange over S7 connections (ISO)
Data exchange over S7 connections (TCP)
ISO transport connections
TCP connections, ISOonTCP and UDP connections
Multicast over UDP connection
FETCH/WRITE services (ISO)
FETCH/WRITE services (RFC, TCP)
NTP mode and SIMATIC mode
via ISO
via TCP
Application and functions
1.3 Network topology with redundancy (PRP)
Ethernet interface
x
-
x
-
x
-
-
x
-
-
-
x
-
RNA interface
x
x
x
x
x
x
x
x
x
x
x
x
x
13
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