| Specifications | Microsoft Word - CP-243-1IT_eng 14-03.doc |
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| Specifications | Microsoft Word - CP-243-1IT_eng 14-03.doc |
| Business section |
| Specifications | Microsoft Word - CP-243-1IT_eng 14-03.doc |
| Suggested Link Details/Purchase | |
| Content | 03/03 Features and Functions CP 243-1 IT J31069-D0429-U001-A0-7618 41 2.6 Security 2.6.1 Configuration Part of the configuration of the CP 243-1 IT is retentively stored on the S7-200 CPU and part in the file system of the CP 243-1 IT. The validity of the portion of the configuration stored on the S7-200 CPU is secured by a CRC routine. In contrast, no CRC routine is used for the portion of the configuration stored in the file system of the CP 243-1 IT. While storing a configuration on the CP 243-1 IT, STEP 7 Micro/WIN 32 calculates a CRC checksum. This checksum is stored together with one part of the configura- tion. While reading out the portion of its configuration stored on the S7-200 CPU, the CP 243-1 IT checks this checksum so that it can detect undesired changes in the stored configuration data. This CRC routine can also be deactivated, however. The configuration can then be changed manually or by an S7-200 user program. Caution Since, after the CRC check is disabled, the CP 243-1 IT is no longer able to check the configuration data for consistency concerning desired or undesired changes, there is no guarantee whatsoever that the CP or the components connected to the network will function correctly. Caution The CP 243-1 IT recognizes that the CRC is disabled by a special value of a byte in its configuration. If precisely this value is set in the configuration either coinci- dentally or intentionally, this may disable the CRC test. This is why we strongly recommend only creating the configuration with the Internet wizard integrated in STEP 7 Micro/WIN 32 and checking the S7-200 program for memory operations which affect in the data area in which the configuration data of the CP 243-1 IT are stored. |
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| Following Datasheets | CP242-8_en (142 pages) CP243-1_en (82 pages) da21-1-2004_en (14 pages) da21-1_en (168 pages) DA_51_2_v2_cz (115 pages) doc_s7_200_hmi_max_connections_cz (1 pages) doc_s7_200_max_io_table_2002_cz (5 pages) doc_s7_200_quick_reference_info_en (6 pages) dodatky_simatic_MM440_cz (10 pages) faq_s7_200_hi_speed_measuring_en (5 pages) |
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