New to S7-300

Hello.

I am an apprentice in automation, and I've gotten my hands on the S7 software. I'm very intrested in PLC, and I want to learn as much as I can about it.
I'm having trouble understanding the S7 software, especially the part about analogue signaling.
I'm trying to set up a continious controlling loop (just for testing, no real instruments, just using the simulator).

I wonder if anyone can guide me trough (from the very start) how to approach?
I don't have much bearings about the data types or what needs what or how to control the input and output signals.

The CPU I'm trying with is 313C. I work best in Ladder. Where do I start? How do I set up the symbol list for analogue signaling? Which adresses should I use, and if anyone got good ideas to keep it clean, yell them out, because I'm having some trouble organizing all the blocks in my tries.

First questions: Why does every FB need a DB? Do the controller FB41 need to be called in a special OB? Can I use multiple FB41?
I'm primarily using 4-20 mA inputs/outputs. What data type will that be using, and how do I convert them to use in the FB41?

Thanks for the help!

Are you using PLCSIM or the real CPU with h/w simulator modules ?

For First question: fb needs data block as instace data block if you don't want db use fc instead fb and fc use also db as shared

I want to help you. Can you send your problem clearly?

Here's a starter to get used the the tool.

Implement a program in OB1 that counts 0 to 1 transitions from a digital input using the following three methods:

A - Using a S7 counter
B - Using an IEC counter
C - using your own logic to perform the counting

Show the result of the count in decimal in a different marker word for each method.

Did you consider attending a training course to get a flying start? Both Siemens, Solar Elektroengros (and problably more) holds courses regularily. You might also find this link interesting.

Kalle