Siemens SIMATIC NET CP 243-1, Operating Instructions Manual

Page: 32 / 142

Application and properties
1.7 Configuration and programming
CP 243-1
32
Operating Instructions, 03/2012, C79000-G8976-C244-02
The TCP/IP connection to the HTTP server is always handled via port 80.
Constraints for reaction times
On the CP 243-1, HTTP communication is subordinate to S7 communication. Reaction times
vary with the particular configuration and a generalized prediction is not possible.
The HTTP server located on the CP 243-1 has four communications channels (in other
words, it can process up to four requests at the same time). If a request arrives at the HTTP
server when all four communication channels are in use, the request is rejected. New
requests cannot be processed until at least one of the four communication channels is free
again.
1.7 Configuration and programming
Configuration
The CP 243-1 is configured with Micro/WIN Version 4.0.8. To allow compatibility it can also
be configured with version 3.2.3 or higher, but in this case the functionality is restricted. The
standard CP 243-1 ships with a fixed MAC address. IP address and subnet mask must be
configured or obtained from a BOOTP/DHCP server.
Programming
Use the Internet wizard of STEP 7 Micro/WIN 32 to program communication in the user
program (see section Configuring a CP 243-1 with STEP 7 (Page 57).
Configuration data and memory organization
The firmware of the CP 243-1 is programmed on flash memory during production and is
stored there permanently. System states or dynamic variables that result during operation of
the CP 243-1 are lost when power is turned off.
The configuration data for the CP 243-1 is divided into the following areas:
●
Industrial Ethernet
The Ethernet configuration is stored retentively in the variables memory of the S7-200
CPU. During startup, the CP 243-1 reads the configuration from the CPU and initializes
itself accordingly, see also section Storing the configuration data (Page 36).
● IT services
The configuration of the IT services is stored in the file system of the CP 243-1 in the
form of configuration files, one each for user administration, FTP client and e-mail
service. These configuration files are continuously evaluated during operation, see also
section File system (Page 33).