By Hans Berger
SIMATIC is the global confirmed automation approach for enforcing commercial regulate structures for machines, production crops and commercial strategies. correct open-loop and closed-loop regulate projects are formulated in a variety of programming languages with the programming software program STEP 7. Now in its 6th variation, this ebook supplies an advent into the most recent model of engineering software program STEP 7 (basic model) . It describes components and functions of text-oriented programming languages assertion checklist (STL) and dependent regulate language (SCL) to be used with either SIMATIC S7-300 and SIMATIC S7-400, together with the recent purposes with PROFINET and for verbal exchange 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 functions of the SIMATIC S7 automation process. All programming examples present in the ebook - or even a couple of additional examples - can be found on the obtain sector of the publisher's site.
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Extra info for Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 Programmable Controllers
4 GHz and 5 GHz, with transmis- 41 1 SIMATIC S7-300/400 Programmable Controller sion rates up to 54 Mbit/s (depending on country approval). You can exchange data with S7 and IE communications via Industrial Ethernet and you can use the S7 functions. With appropriately designed modules, you can also establish ISO transport connections, ISO-on-TCP connections, TCP, UDP and e-mail connections. PROFINET PROFINET is the open Industrial Ethernet standard of PROFIBUS International (PNO). PROFINET uses the Industrial Ethernet subnet as the physical medium for data transmission, and takes into account the requirements of industrial automation.
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”. Analog modules, FMs and CPs receive an address that is not in the process image.
If the complete control program is larger than the integrated load memory, you will need a RAM memory card for testing. 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.