you are working with Siemens stuff and you are in sh*t. doesn't detract from the fact you paid for it. maybe you had the licence and 'optimised' your hard drive (which loses all your licence). maybe you didn't buy the software but you need to have the licence to programme Siemens kit. Lets take an example, if you need authorisation you have either bought the software and bolloxed up the disk you had. I have a problem with this key disk issue and authorisation.įor me it's all bullsh***. Juergen Mueller - Controlling with SIMATIC - ISBN978-3-89578-255-8.
Testing and service functions for startup and maintenance. Rewiring inputs, outputs, flags, timers and counters. Transferring blocks to EPROM and EEPROM memory modules for programmable controllers. Automatic generation and updating of cross-reference lists. 
System operations (direct access the operating system) - These can only be executed in STL. substitution statements, testing functions, word-by-word logic operations, decrement/increment and jump functions.) - These can only be executed in STL. Supplementary operations and complex functions, (e.g. linking, saving, loading & transferring, counting, comparing, arithmetic operations, module operations) - These can be performed in all three representations. 
STEP 5 differentiates between three types of operations:
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