Application And Functions; Properties Of The Cp - Siemens SIMATIC NET CP 442-1 RNA Equipment Manual

Application and functions

1.1

Properties of the CP

Application
The CP is intended for use in an S7400 or S7400H (faulttolerant) automation system. It allows
the S7400 / S7400H to be connected to Industrial Ethernet.
The CP has the following interfaces:
• Ethernet interface
The CP has a 100 Mbps Ethernet interface. The Ethernet interface can be used as an
alternative to the RNA interface. The Ethernet interface can, for example, be used to
connect to a PG/PC or to a higherlevel company network.
For special situations, each port can be set to a fixed mode manually using STEP 7, for
example 10 or 100 Mbps half duplex / full duplex.
• RNA interface
The RNA interface has 2 ports. These two ports are used as follows:
– PRP mode with both ports as a redundancy solution
– Port 1 as the only used port of the RNA interface with 100 Mbps full duplex (port 2 is
The RNA interface only supports the "automatic setting" mode with 100 Mbps full duplex.
The communications partner must use the same settings.
Each port supports autocrossing and autonegotiation and is equipped with a combined
RXD/TXD / LINK dual LED for simple diagnostics.
Note
Interfaces can only operated as alternatives
The Ethernet interface or the RNA interface can only be enabled as alternatives (one or the
other). Simultaneous use of both interfaces is not possible. These are activated during
configuration with STEP 7. Note further information in the section Switching over interfaces
(Page 44)
CP 442-1 RNA
Equipment Manual, 03/2022, C79000-G8976-C318-05
disabled)
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