09/02 Features and functions
CP 243-1
J31069-D0428-U001-A1-7618
13
Data exchange via Industrial Ethernet
The exchange of data via the CP 243-1 is based on Ethernet and is therefore not
deterministic, i.e. response times cannot be guaranteed. Network support is pro-
vided for 10 and 100 Mbit networks, each in full-duplex and half-duplex mode.
Furthermore, the CP 243-1 supports the "Auto Negotiation" function for the auto-
matic negotiation of the mode and the transmission rate to be used. The mode and
the transmission rate can also be defined by the user when configuring the
CP 243-1. If the CP 243-1 was not provided with a valid configuration, it always
uses the “Auto Negotiation“ mode by default.
Note
The Auto Negotiation mode only operates if all connected network components
support this mode.
Industrial Ethernet and TCP/IP do not permit time-deterministic data flows. It can-
not be predicted at what time a remote CPU will execute the requested commands.
The responses from the remote CPU are asynchronous to the CPU cycle of the lo-
cal CPU. Therefore, TCP/IP-based communication has only limited suitability for
distributed applications with time-related requirements (e.g. control loop, periodic
sampling).
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