Siemens SIMATIC NET CP 243-1, Руководство по эксплуатации

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Application and properties
1.10 Safety
CP 243-1
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Operating Instructions, 03/2012, C79000-G8976-C244-02
● Read access to status information of the CP 243-1 from a Web browser
● Access to the file system via the FTP server with the following restrictions:
–
Only the administrator may access the directory /__S7Sys.
– Only the administrator may store the configuration file for the user administration (.udb
file) in the file system of the CP 243-1.
Note
HTML pages can be accessed by a Web browser without password protection.
Password protection is not activated until process values of the S7-200 system are
accessed by such pages.
Note
We recommend that the 8 configurable users do not have access with FTP. If a user is
permitted access with FTP, this user can also change the configuration data stored in
the file system of the CP 243-1
Note
To keep the configuration effort involved in user administration as low as possible, we
recommend that you configure abstract users with special rights (for example
"commissioning" "maintenance" or "production") instead of natural users (for example
"John Anyman").
Character set and number of characters for entering the user name/password
Role User name Password
Administrator 1 to 16 characters 8 to 16 characters
User 1 to 32 characters 1 to 32 characters
Length of the user names and passwords
All ASCII characters between 0x21 and 0x7E can be used for a user name and password.
1.10 Safety
1.10.1 Storing the configuration data
Part of the configuration of the CP 243-1 is stored retentively on the S7-200 CPU and part in
the file system of the CP 243-1. The validity of the part of the configuration stored on the S7-
200 CPU is checked using by a CRC mechanism. In contrast, no CRC mechanism is used
for the part of the configuration stored in the file system of the CP 243-1.