For a year in 2011, as a freelancer, I wrote and implemented software for managing a water station. As a result, the system turned out to be distributed and even a little complicated, but it all started with a local control station for one pumping unit.
The project organization laid the foundation for the CPU Simatic S7-313C. The hardware release was still with 64 kilobytes of working memory, while the current versions are equipped with as much as 128 kilobytes. The controller controlled two valves with Auma Matic AM01.1 drives on the profibass and, on the profibass, a Robicon frequency converter (I don't remember the model, a hefty crap at least megawatts of usable power).
That is, here we have a technologically uncomplicated pumping unit - a pressure valve, a suction valve, pressure sensors, a pump tied with vibration and temperature sensors, a vacuum switch for a frequency converter, light bulbs / buttons on the cabinet, an operator panel.
Suddenly I was wondering how it will look on the new Simatic line? Will the application fit, is it easy to port? How much is the solution - implemented earlier and selected by me now?
From my point of view, such a simple system should be done today on the S7-1200, which is why it was chosen as the target system.
Porting the application turned out to be easy. I had to tinker only in a few places. First, in the classic Step 7 (version 5.5 SP4), I replaced the equipment to the current order numbers. This Step 7 knows all its hardware from the moment it was published. The TIA Portal is limited to more or less current releases. And Stepa decided to migrate the application software from the "old" to the "new" completely, including the hardware configuration.
- STL. , S7-1200 STL . . , .. , LADe MOVE. , LAD STL.
LAD SCL.
- -, - . S7-300 CP 343-1 LEAN . . . . , .
- . , DPRD_DAT DPWR_DAT. , . - . , .
, . , , .
CPU, , , , DI16 DO16. DI16 DO16 . DIO8/8. AI8 .
. S7-1214 — CPU. . , Profibus, CM1243-5, . , , , .
, .
:
, 24 35 — .
S7-1200 :
14 . . PNIOSEND, PNIOECV. — . , . , . . , .
, , .
Please note that here, for optimization, I replaced two discrete modules DI16 and DO16 with one combined DI / DO 8/8. And I also chose a 64 kB MMC memory card in order to reduce the cost of the system (a reasonable approach to business requires that the amount of boot memory, the so-called flash drive, be larger than the working memory). Rounding up, we get the cost of 3400 oiro excluding VAT.
I wonder what happened on the S7-1200?
Even taking into account the use of the expensive Profibus DP Master module, even taking into account the use of a DIN rail for 30 euros, the assembly turned out to be almost two times cheaper, 1630 euros. With the same functionality.