Siemens S7-300 Question

Clay B. · Feb 3, 2009

I think I know but I want to be sure. If I have a Db adress say DB50.DBW1 and I want to look at the LSB bit of that word. Would that adress be DB50.DBW1.0?

What I am trying to do is create a flip flop from the Db word. The DB word is my the sum of an add function where I add a 1 per pulse of an input.

STL??? · Feb 3, 2009

Hi,
the address you defined is inefficent because it is on an odd boundary it should be DB50.DBW0 or DBW2 etc

See attachment for code example

Clay B. · Feb 3, 2009

Ok if the adress is DB67.DBW2 would the LSB the be DB67.DBX2.0 or DB67DBX3.0 or something else?

My DB50.DBW1 was just an adress I made up. The actual adress I am using is DB67.DBW2

Jeebs · Feb 3, 2009

Clay B. said:
Ok if the adress is DB67.DBW2 would the LSB the be DB67.DBX2.0 or DB67DBX3.0 or something else?

My DB50.DBW1 was just an adress I made up. The actual adress I am using is DB67.DBW2

It's in bold

Clay B. · Feb 3, 2009

Got it

OK My LSB for word DB67.DBW2 is DB67.DBX3.0 Now to figure out how to make that work for me.

Clay B. · Feb 3, 2009

Thanks LD. I made a sample program with a one second clock and figured it out.

STL??? · Feb 3, 2009

DB67.DBW2 consists of DBB2 & DBB3 so the LSB of DBB2 = DBX2.0 and LSB of DBB3 = DBX3.0

so 2#0000_0000_0000_0001 is when DBX3.0 = 1
and 2#0000_0001_0000_0000 is when DBX2.0 = 1

Edit: too slow

Siemens S7-300 Question

Clay B.

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STL???

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Clay B.

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Jeebs

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Clay B.

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Clay B.

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STL???

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