Siemens S7 - How does the CPU read code?

inalvor1

Member
Join Date
Apr 2012
Location
Malmö
Posts
27
Have I gotten this right?

Examples:
SCL uses it's own compiler to make STL
LAD & FBD are graphical representations of STL
STL is compiled and saved in MC7 (In File folder, MMC and on PLC)

300 series (not 318) interprets MC7 into it's own machine language.

318 and 400 series processes MC7 directly, due to the ASIC circuit.

Please post if I am wrong, or I have missed something.


I'd also love to know in what memory type the 300 series "machine language" is cached. Is everything in "System memory" actually "machine language" or is it only while the CPU processes the instruction that it interprets?
 

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