between s5 c db and s7 opn db

What is diferent between S5 C DB and S7 OPN DB?

I found that when i convert the program from s5 to s7

the function of OPN DB can only execute in that

particular network and cannot call the other data for following

network.

teh said:

What is diferent between S5 C DB and S7 OPN DB?

I found that when i convert the program from s5 to s7

the function of OPN DB can only execute in that

particular network and cannot call the other data for following

network.

Click to expand...

I can't help with the S5 part, never worked with that, however I'm a bit puzzled by your statement about the OPN DB command. Once you've opened a DB it stays open until another DB is opened, either explicitly, or implicitly, by using a fully qualified address, such as:

L DB1.DBW0

The OPN DB command is not limited by network boudaries.

Duplicate thread - refer to

http://www.plctalk.net/qanda/showthread.php?t=40258

they are similar to each other and it is define the data block no. will deal with it