Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 by Hans Berger
By Hans Berger
SIMATIC is the global confirmed automation method for imposing commercial keep watch over platforms for machines, production crops and commercial methods. correct open-loop and closed-loop keep an eye on projects are formulated in quite a few programming languages with the programming software program STEP 7. Now in its 6th variation, this booklet supplies an advent into the most recent model of engineering software program STEP 7 (basic model) . It describes components and purposes 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 hot functions with PROFINET and for communique over business Ethernet. it's aimed 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 approach. All programming examples present in the ebook - or even a couple of additional examples - can be found on the obtain quarter of the publisher's web site.
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Additional resources for Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 Programmable Controllers
In extended mode, the complete scope of functions is available in accordance with the AS-i master specification. When using the provided FC block, master calls from the user program (transmission of parameters during ongoing operation, checking of the reference/actual configuration, testing and diagnostics) can be carried out in addition to standard operation. 2 Distributed I/O AS-i slaves AS-i slaves can be bus-capable actuators or sensors with AS-i ASIC, or also AS-i modules. Actuators and sensors with AS-i ASIC are connected to a passive module.
The subnets are connected using RJ45 connectors. Two connections with internal switch function are available for each subnet. From the viewpoint of the relevant IO controller, the PN/PN coupler is an IO device in its own PROFINET IO system. Both IO devices are linked by a data transfer area with 256 input bytes and 256 output bytes, divisible into a maximum of 16 areas. Input areas in one subnet must correspond to output areas in the other. The PN/PN coupler is configured and parameterized with STEP 7.
The process image can be subdivided into subsidiary process images that can be updated either automatically or via the user program. 1 “Process Image Updating”. 48 An input is an image of the corresponding bit on a digital input module. Scanning an input is the same as scanning the bit on the module itself. Prior to program execution in every program cycle, the CPU’s operating system copies the signal state from the module to the process input image. b Inputs can be scanned and linked bit by bit (I/O bits cannot be directly addressed).