By Hans Berger
SIMATIC is the global tested automation procedure for imposing business regulate structures for machines, production crops and commercial tactics. correct open-loop and closed-loop keep watch over initiatives are formulated in numerous programming languages with the programming software program STEP 7. Now in its 6th version, this ebook offers an creation into the most recent model of engineering software program STEP 7 (basic model) . It describes parts and purposes of text-oriented programming languages assertion checklist (STL) and dependent 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 really 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 process. All programming examples present in the e-book - 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 info for Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 Programmable Controllers
In the case of analog modules, the individual analog signals (voltages, currents) are called “channels”, each of which occupies two bytes. Analog modules are available, depending on design, with 2, 4, 8 and 16 channels, corresponding to 4, 8, 16 or 32 bytes of address. By means of the hardware configuration, you assign a logical address to each byte of a used module. As standard, addresses are assigned starting with zero; however, you can change the proposed address. The logical addresses of the individual modules must not overlap.
3). The system memory on a CPU contains the following address areas: A CPU 300 or CPU ET 200 does not have an integrated load memory. A micro memory card containing the load memory must always be inserted to permit operation. The load memory can be written and read like a RAM. The physical design means that the number of write operations is limited (no cyclic writing by user program). You can use the menu command COPY RAM TO ROM to transfer the current values of the data operands from the work memory to the load memory.
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. 45 kbit/s for PROFIBUS PA. The diagnostics repeater is configured and parameterized using STEP 7. A GSD file is available for operation on non-Siemens masters.
Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 Programmable Controllers by Hans Berger