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

By Hans Berger

SIMATIC is the global demonstrated automation procedure for enforcing commercial regulate platforms for machines, production vegetation and business approaches. suitable open-loop and closed-loop keep watch over projects are formulated in numerous 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 functions of text-oriented programming languages assertion checklist (STL) and based keep an eye on language (SCL) to be used with either SIMATIC S7-300 and SIMATIC S7-400, together with the recent functions with PROFINET and for conversation over business Ethernet. it really is geared toward all clients of SIMATIC S7 controllers. First-time clients are brought to the sphere of programmable controllers, whereas complex clients know about particular functions of the SIMATIC S7 automation method. All programming examples present in the booklet - or even a number of additional examples - can be found on the obtain region of the publisher's web site.

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

Sample text

The connections are established dynamically as required. The communications functions required for S7 basic communication are integrated in the CPU’s operating system. They can trigger data transmission, for example using system functions SFC in the user program. Station-internal S7 basic communication is executed over PROFIBUS, station-external over MPI. S7 communication S7 communication is an event-driven service for exchanging larger quantities of data between CPU modules with control and monitoring functions.

The “actual” control program is executed in the work memory. Specific to the product, the work memory can be either a coherent area or divided according to program and data memories, where the latter is also divided into retentive and non-retentive parts. 5 “Block Handling”). System memory System memory contains the addresses (variables) that you access in your program. The addresses are combined into areas (address areas) containing a CPU-specific number of addresses. Addresses may be, for example, inputs used to scan the signal states of momentary-contact switches and limit switches, and outputs that you can use to control contactors and lamps.

As standard, addresses are assigned starting with zero; however, you can change the proposed address. The logical addresses of the individual modules must not overlap. The logical addresses are assigned separately for the input and output modules, meaning that an input byte can have the same number as an output byte. The user data of the distributed I/O can also be addressed byte-by-byte using a logical address. In order to guarantee unambiguous assignment of all user data of a CPU (or more exactly: all user data on a P bus), the logical addresses of the distributed I/O must not overlap with the logical addresses of the central modules.

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