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03/03
4
Configuration
4.1
Possible Configurations
Using the CP 243-1 IT, an S7-200 system can communicate via the S7 protocol
with both another S7-200 system and an S7-300 or S7-400 or an OPC-based sys-
tem. Using the IT protocols SMTP, FTP and HTTP, communication is also possible
with any computer system which supports this protocol.
There are two ways to configure one of the communication modes for an S7-200
system.
• Configuration via STEP 7 Micro/WIN 32 starting with version 3.2.3
• Configuration via an S7-200 user program
The configuration data for the IT services are kept in the file system of the CP 243-
1 IT. They are read during startup and then monitored continuously for changes.
This means that every change to these data during running operation is immedi-
ately accepted by CP 243-1 IT. All other configuration data are stored in the data
block of the S7-200 CPU. From there, these data are read once each time a new
start of the CP 243-1 IT occurs.
Caution
A change to the configuration stored on the S7-200 CPU by an S7-200 user pro-
gram is only possible when the CRC routine is disabled.
Since, after being disabled, the CRC routine of the CP 243-1 IT can no longer
completely check these configuration data for consistency of intended or unin-
tended changes, there is no guarantee whatsoever that the CP or the components
connected in the network will function correctly for this application.
Caution
To ensure that the configuration data of the CP 243-1 IT stored on the S7-200 CPU
will also be retained when a power failure occurs, these data must be stored in a
retentive memory area on the S7-200 CPU.
With a standard S7-200 system, the entire data block is defined as retentive. How-
ever, this default setting may have been changed on your S7-200 system when the
configuration is modified.
Changes to the configuration data stored on the S7-200 CPU do not take effect un-
til the next new start of the CP 243-1 IT. When STEP 7 Micro/WIN 32 is used for
new/modified configuration of the CP 243-1 IT, this automatically triggers a new
start of the CP 243-1 IT as soon as the operating mode changes from STOP to
RUN. If, in contrast, the configuration of the CP 243-1 IT is done directly by the S7-
200 user program, this configuration can be activated from the user program by
calling the subprogram "ETHx_CFG." Calling this subprogram also triggers a new
start of the CP 243-1 IT.
CP 243-1 IT
J31069-D0429-U001-A0-7618
Configuration
55
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