Configuration
3.3 Configuring a CP 243-1 with STEP 7
CP 243-1
60 Operating Instructions, 03/2012, C79000-G8976-C244-02
For the transport communication access points (TSAPs) of your communications partner,
refer to the configuration of the specific partner. With an S7-200 system, this is created with
STEP 7 Micro/WIN 32. With an S7-300, S7-400 or OPC-based system, use STEP 7 (see
also chapter Other options when configuring a CP 243-1 (Page 65)).
Note
The specified communication access points (TSAPs) in STEP 7 and in STEP 7 Micro/WIN
32 must be compatible.
Enabling/disabling the CRC mechanism and specifying the monitoring time
After you have finished configuring the S7 connection, another dialog opens in which you
decide whether your configuration data on the S7-200 CPU will be protected against
accidental overwriting by using CRC.
If CRC is activated, during startup the CP 243-1 checks whether the configuration that it
reads from the memory of the S7-200 CPU was overwritten by the user program. If it was, it
interrupts the startup and attempts to obtain its TCP/IP address parameters from a
BOOTP/DHCP server. If it succeeds, startup is continued. However, only the Micro/WIN
channel is enabled afterwards. The CP 243-1 can then only communicate with STEP 7
Micro/WIN 32 but not with other partners.
We recommend that you always activate CRC. This is the only way in which the CP 243-1
can detect that the user program has made undesired changes to the configuration data.
If CRC is not enabled, your user program can change the configuration data of the CP 243-
1. However, the CP 243-1 does not recognize that data has been accidentally overwritten.
NOTICE
An S7-200 user program can only change the configuration data on the S7-200 CPU when
CRC is disabled.
After CRC is disabled, the CP 243-1 can no longer check the configuration data for
consistency in terms of desired or undesired changes, and there is therefore no guarantee
that the CP or the components connected to the network will function correctly.
In the same dialog you also can set a common keepalive time for all configured connections.
The value entered here is the time after which the CP 243-1 recognizes the problem
described in chapter Reliability of communication (Page 38).
You spe
cified which connections are to be monitored with this time when you configured the
individual connections.
Setting up an administrator
The next dialog (administrator account) is used to specify the user identifier and the
password for the administrator. You also specify whether the administrator will have the right
to access the process data of the S7-200 system with a Web browser.
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