Application and properties
1.6 IT communication
CP 243-1
Operating Instructions, 03/2012, C79000-G8976-C244-02
29
They can be copied to a development computer and then linked to form your own Java
applets in a Java development environment. The beans included with the CP 243-1 are Java
components that provide functions that can be used repeatedly when creating an operator
control and monitoring interface. This not only includes functions for read or write access to
individual process values but also graphic functions for visualization of such values.
The relevant manual "S7Beans / Applets for IT CPs" is available on the Customer Support
pages under the following entry ID:
24843906 (http://support.automation.siemens.
com/WW/view/en/24843906)
On the Internet page, select the "Entry list" tab and the "Manuals" entry type.
This document describes the individual beans in greater detail. This also includes a detailed
description of how to put these beans together to form Java applets.
If the Java beans described in this document are used to access an S7-200 via a CP 243-1,
symbolic addressing cannot be used. Using the HTML pages and Java applets supplied in
the file system of the CP 243-1, the following data areas and data types of the S7-200
system can be accessed:
● Data types:
BOOL, BYTE, CHAR, WORD, INT, DWORD, DINT and REAL
● Data areas:
Inputs (I), outputs (Q), bit memory (M), variables (V) and special memory (SM).
Note
The availability of the data types CHAR, INT, DINT and REAL depends on the firmware
version of the S7-200 CPU being used, see Access by CP 243-1 to S7-200/300/400
(Page 126).
Access protection
There is no access protection when calling the HTML pages stored in the file system of the
CP 243-1 with a Web browser. Such protection is not activated until status or process
variables are accessed by a Web browser or when an attempt is made to send a test e-mail
using the HTML page.
The basic access authentication described in RFC 2617 is used as the authentication
mechanism for all password-protected HTML pages.
In this case, users must authenticate themselves with their user names and the
corresponding passwords. Access is then granted or refused by the HTTP server of the CP
243-1 depending on the access rights assigned to the user by user administration.
The HTTP server of the CP 243-1 can always be enabled/disabled in the configuration.
HTML pages on the CP 243-1
The file system of the CP 243-1 contains predefined HTML pages in English in which the
linked Java applets supply status and diagnostic information. These HTML pages can be
edited or expanded by the user with an HTML editor or a standard editor.
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