By Hans Berger
SIMATIC is the global demonstrated automation method for enforcing commercial keep an eye on platforms for machines, production crops and business strategies. suitable open-loop and closed-loop regulate projects are formulated in a number of programming languages with the programming software program STEP 7. Now in its 6th variation, this booklet offers an advent into the newest 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 purposes with PROFINET and for verbal exchange over commercial Ethernet. it's 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 process. All programming examples present in the publication - or even a couple of additional examples - can be found on the obtain sector of the publisher's site.
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Extra resources for Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 Programmable Controllers
Peripheral inputs You use the peripheral input (PI) address area when you read from the user data area on input modules. Part of the PI address area leads to the process image. This part always begins at I/O address 0; the length of the area is CPU-specific. With a Direct I/O Read operation, you can access the modules whose interfaces do not 47 1 SIMATIC S7-300/400 Programmable Controller lead to the process input image (for instance analog input modules). The signal states of modules that lead to the process input image can also be read with a Direct Read operation.
Single or multiple PROFIBUS slaves or segments with PROFIBUS slaves can be linked by a wireless connection when using the PROFIBUS infrared link module (ILM). 5 Mbit/s and a maximum range of 15 m, communication is possible with moving parts. You implement connection of distributed I/O via a PROFIBUS network; the relevant PROFIBUS DP communications service is implicit. You can use either CPUs with integral or plugin DP master, or the relevant CPs. You can also operate station-internal S7 basic communications or S7 communications via this network.
The RS 485 repeater combines two bus segments in a PROFIBUS subnet. The number of bus stations and the size of the subnet can then be increased. 2 or higher, and also displayed graphically. From the user program, the line diagnostics is triggered using the system function SFC 103 DP_ TOPOL, and read using SFC 59 RD_REC or SFB 52 RDREC. To adjust the clock on the diagnostics repeater, read the CPU time using the system function SFC 1 READ_CLK and transmit it using SFC 58 WR_REC or SFB 53 WRREC. The repeater provides signal regeneration and electrical isolation.