By Hans Berger
SIMATIC is the global demonstrated automation process for imposing business keep an eye on structures for machines, production crops and business methods. proper open-loop and closed-loop keep an eye on initiatives are formulated in a variety of programming languages with the engineering software program STEP 7.
Ladder diagram (LAD) and serve as block diagram (FBD) use picture symbols to show the tracking and keep watch over services comparable these utilized in schematic circuit diagrams or digital switching platforms. Now in its 5th variation, this publication describes those graphic-oriented programming languages mixed with the engineering software program STEP 7 V5.5 to be used with either SIMATIC S7-300 and SIMATIC S7-400 automation platforms. New features of this STEP 7 model are specially relating to CPU-Webserver and PROFINET IO like for instance the applying of I units, shared units and isochrone mode.
It is geared toward all clients of SIMATIC S7 controllers. First-time clients are brought to the sphere of programmable controllers, whereas complex clients find out about particular functions of the SIMATIC S7 automation system.
All programming examples present in the publication - or even a number of additional examples - can be found over the publisher's web site less than Downloads.
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Extra resources for Automating with STEP 7 in LAD and FBD: SIMATIC S7-300/400 Programmable Controllers
Over an MPI subnet, you can exchange data between CPUs with global data communications, station-external S7 basic communications or S7 communications. No additional modules are required. 3 Communications PROFIBUS PROFIBUS stands for “Process Field Bus” and is a vendor-independent standard complying with IEC 61158/EN 50170 for universal automation (PROFIBUS DP and PROFIBUS FMS) and for process automation according to IEC 61158-2 (PROFIBUS PA). The maximum number of nodes in a PROFIBUS network is 127, where the network is divided into segments with up to 32 nodes.
A module is uniquely described using the slot address (“geographical address”). 9 Correlation between Module Address, Absolute Address and Symbolic Address (Path of a Signal from Sensor to Scanning in the Program) 43 1 SIMATIC S7-300/400 Programmable Controller If the module contains interface cards, each of these cards is also assigned a submodule address. In this way, each binary and analog signal and each serial connection in the system has its own unique address. Correspondingly, distributed I/O modules also have a “geographical address”.
The communications function in the example is a system function block (SFB). Assign the parameter RD with a pointer to the data to be sent, and trigger the transmission from the program. The communications function is additionally assigned a connection ID with which the used connection is specified. The connection occupies a connection resource in the CPU’s system memory. g. to a CP module in another station via the module's bus interface. Connection resources are used in both the CP module and CPU.