System Theory

Download Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 by Hans Berger PDF

By Hans Berger

SIMATIC is the global verified automation approach for imposing business keep watch over structures for machines, production crops and business approaches. correct open-loop and closed-loop regulate projects are formulated in quite a few programming languages with the programming software program STEP 7. Now in its 6th variation, this ebook supplies an advent into the newest model of engineering software program STEP 7 (basic model) . It describes parts and purposes of text-oriented programming languages assertion record (STL) and established regulate language (SCL) to be used with either SIMATIC S7-300 and SIMATIC S7-400, together with the recent functions with PROFINET and for verbal exchange over business Ethernet. it's geared toward all clients of SIMATIC S7 controllers. First-time clients are brought to the sector of programmable controllers, whereas complicated clients know about particular purposes of the SIMATIC S7 automation procedure. All programming examples present in the booklet - or even a couple of additional examples - can be found on the obtain region of the publisher's site.

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Additional resources for Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 Programmable Controllers

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The optical network uses either plastic, PCF or glass fiber-optic cables. This is suitable for large distances, provides electrical isolation, and is insensitive to electromagnetic influences. 6 kbit/s to 12 Mbit/s. With optical link modules (OLMs), it is possible to produce a line, ring or star topology. An OLM also enables connection between electrical and optical networks with a mixed design. A cost-optimized version is the design as a line topology with integral interface and optical bus terminal (OBT).

36 The PROFIBUS DP/RS 232C link is connected to the device via a point-to-point connection. Conversion to the PROFIBUS DP protocol takes place in the PROFIBUS DP/RS 232C link. The data are transferred consistently in both directions. Up to 224 bytes of user data are transmitted per frame. 4 kbits/s with no parity, even or odd parity, 8 data bits and 1 stop bit. Connection of two PROFINET subnets With the PN/PN coupler, you interconnect two Ethernet subnets in order to exchange data between the IO controllers of both subnets.

The scanning and linking of the outputs makes additional storage of the output bit to be scanned unnecessary. These advantages are offset by an increased program response time. 4 “Response Time” describes how a programmable controller’s response time comes about. 3 Consistent User Data Data consistency means that data must be handled as an entity. Transmission of the data field must not be interrupted, and the data source and target must not be changed from the other side during the transmission.

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