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Awlsim is a free Step 7 AWL/STL PLC simulator.

Depending on the host machine and the Python interpreter used, it achieves
good performance of several thousand to millions of AWL/STL instructions
per second.
German and english AWL/STL mnemonics are supported. 
S7-300 and S7-400 CPUs (with 2 and 4 accus) are supported.

Compatibility to Siemens STEP 7 is documented in COMPATIBILITY.txt.

Awlsim has got a hardware interface with existing PROFIBUS-DP (proof-of-concept)
and LinuxCNC plug-in modules.
bues.ch cgit interface