Where i can find information about...

Hello!
I have some problems with this.
I try to find information. Books, tips, manuals, ur expirience.

1. Why in symbol table i see this.

What does that mean "Data type of DB 90 is FB41"?
What should I do for it to appear? Which action in the code is the cause for it?

2. I know, that LD - is Dword in Local Stack. But can u give me information about it?
How i can use it? Where is it stored and keep information? How i can check it? Change it?

Hello,

1. in your block there are multiple call of FB41..... serch for multiple instances (like here).

2.if you search for local data you can have a lot of info (like this)

Best Regards

Sapher_Jalt

Hello!
I have some problems with this.
I try to find information. Books, tips, manuals, ur expirience.

1. Why in symbol table i see this.

What does that mean "Data type of DB 90 is FB41"?
What should I do for it to appear? Which action in the code is the cause for it?

Hello Sapher_Jalt,

1. Every FB needs memory to store its variables. (Temp variables are only kept for one cycle). So if you have e.g. a PID program inside FB41 with a lot of variables you need to link this FB to a instance DB. Let's say you call FB41 in OB35, you can create DB90 as an instance DB from FB41. 

If you have multiple PID items in your project, you must also call FB41 multiple times, but you can't use DB90 again. This because the second call of FB41 will overwrite the values in its instance DB from the first call. That's why you make a second instance DB like DB91. In your examples this goes up to DB94.

DB90 hasn't got a data type FB41...

Really you must say:

FB41 has an instance DB90 named "iDB_PID_Mill_M01"

I hope this will help you.

Regards,

Alex