AS-Interface Master

Masters for SIMATIC S7

CP 343-2

■Overview

 

■Application

The CP 343-2 is the AS-Interface master for PLC SIMATIC

S7-300 and the distributed I/O device ET 200M. The communi- cations processor offers the following functions:

•Connection of up to 62 AS-Interface slaves and integrated an- alog value transmission (according to expanded AS-Interface Specification V2.1)

•Supports all AS-Interface master functions according to ex- panded AS-Interface Specification V2.1

•Display of operating status and operational readiness of the connected slaves through LEDs in the frontplate

•Display of errors (incl. AS-Interface voltage errors, configura- tion errors) through LEDs in the frontplate

•Compact housing in the design of the SIMATIC S7-300

■Benefits

•Shorter startup times due to easy configuration at the press of a button

•Flexible decentralized topologies can be constructed by using this communications processor in the ET 200M DP slave.

•Reduction of standstill or service times in the event of a fault through LED displays:

-status of the AS-Interface network

-connected slaves and their operational readiness

-monitoring of the AS- Interface voltage level

•Reduced costs for spare parts inventories because the CP can be used in both the SIMATIC S7-300 and in ET 200M.

•Ideal for complex applications through the connection option of 62 slaves and integrated analog value processing

The CP 343-2 is the AS-Interface master connection for SIMATIC S7-300 and ET 200M. Connection to the AS-Interface allows ac- cess to max. 248 DI/186 DO per CP.

The integrated analog value processing also supports evalua- tion of very simple analog signals (per CP at max. 31 analog slaves, each with four channels).

■Design

The CP 343-2 is connected to the S7-300 like an expansion module. It features:

•Two terminals for direct connection of the AS-Interface cable

•LEDs in the frontplate for displaying the operating status and the operational readiness of all connected and activated slaves

•Pushbuttons for displaying the status information of the slaves, for switching the operating status and entering the existing ACTUAL configuration as the SETPOINT configuration

■Function

The CP 343-2 supports all functions stipulated in the expanded AS-Interface Specification V2.1. Double address assignment (A-

B)makes it possible to operate up to 62 digital or 31 analog slaves at the AS-Interface. Access to analog values is easy

thanks to the integrated analog value processing.

6

All connected AS-Interface slaves are configured at the press of

a button. No further configuration of the CP is necessary.

 

■Mode of operation

In I/O mode, the CP 343-2 reserves 16 bytes in the analog ad- dress space of the SIMATIC S7-300. The I/O data of the standard slaves or A slaves is stored here. The I/O data of the B slaves can be accessed using the "read/ write data record “ function.

A and B slaves are slaves in accordance with the extended AS-Interface specification V2.1. For the AS-Interface master calls (e.g. Write parameter, read diagnostic values), a Function Call (FC) is provided on the diskette that accompanies the manual.

Siemens IK PI · 2004

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Siemens EN 50295 manual Mode of operation
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EN 50295 specifications

Siemens EN 50295 is emerging as a pivotal standard in the domain of electrical safety and design, particularly relevant for the electrical industry and equipment manufacturing sectors. Primarily, this European Norm is geared towards ensuring the safety of electrical systems used in dry environments, which is essential for various industrial applications.

One of the main features of the EN 50295 standard is its comprehensive safety requirements which are aimed at mitigating the risks associated with electrical systems. This includes aspects like insulation resistance, protective earthing, and the management of electrical faults. By setting a benchmark for safety, Siemens EN 50295 assists manufacturers in maintaining compliance with national and international regulations, thus protecting both users and equipment.

The standard emphasizes the importance of safety measures in the design process. It outlines criteria for components, assembly methods, and system installation, ensuring that electrical equipment operates stably and gets rid of risks related to electrical failures. This involves rigorous testing of materials and components, which enhances their reliability and longevity while providing efficient overall operation.

Siemens EN 50295 also incorporates advancements in technology, acknowledging the significance of intellectual innovation in the industry. It encourages the integration of smart technologies and automation features into electrical systems, paving the way for enhanced operational efficiencies. Such technologies not only improve the performance of electric systems but also contribute to energy conservation, reducing the overall environmental footprint.

Another characteristic of the EN 50295 standard is its adaptability. The framework it provides can be customized depending on specific industry needs, making it versatile across various sectors such as manufacturing, construction, and transportation. This adaptability ensures that businesses can maintain high safety standards while still allowing room for innovation and modern practices.

In summary, Siemens EN 50295 presents a well-rounded approach to enhancing safety, reliability, and sustainability in electrical systems. Its features and characteristics are set to guide industries in making informed decisions regarding electrical configuration, ultimately fostering a safer and more efficient working environment. The incorporation of emerging technologies ensures that the standard remains relevant in a fast-evolving technological landscape, proving to be an invaluable asset for manufacturers and service providers alike.
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