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

By Hans Berger

SIMATIC is the global tested automation approach for imposing business keep watch over structures for machines, production crops and commercial methods. proper open-loop and closed-loop keep watch over projects are formulated in quite a few programming languages with the programming software program STEP 7. Now in its 6th version, this publication offers 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 watch over language (SCL) to be used with either SIMATIC S7-300 and SIMATIC S7-400, together with the hot purposes with PROFINET and for communique over business Ethernet. it truly is geared toward all clients of SIMATIC S7 controllers. First-time clients are brought to the sphere of programmable controllers, whereas complicated clients know about particular purposes of the SIMATIC S7 automation approach. All programming examples present in the ebook - 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 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. The digital modules are usually arranged according to address in the process image so that their signal states can be automatically updated and they can be accessed with the address areas “Input” and “Output”.

The tested program is then copied with the programming device to a flash EPROM memory card, which you insert into the CPU for operation. Distributed I/O refers to modules connected via PROFIBUS DP or PROFINET IO. 2 “Subnets”). The work memory of a CPU 400 is divided into two parts: One part saves the program code, the other the user data. The system and work memories in a CPU 400 constitute one (physical) unit. If the process image changes in size, this affects the size of the work memory. 1 Distributed I/O PROFIBUS DP PROFIBUS DP provides a standardized interface for transferring predominantly binary process data between an “interface module” in the (central) programmable controller and the field devices.

G. to a CP module in another station. Connection resources are occupied in both the CP module and the CPU. As a result of the connection ID (and the configured connection path), the communications function “recognizes” the data addressed to it in the receiver station, and writes these by means of the pointer in the RD parameter to the data block of the user program. Subnet Network Connection A network is a connection between several devices for the purpose of communication. It comprises one or more identical or different subnets linked together.

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