S7-300 siemens - RLO STATE

I want to do something in STL if my bit is SET:

A L 19.0
= M50.0
R M50.1

is this the same

A L 19.0
OPN DB [#db_Num]
L P#DBX 0.0
LAR1
= M50.0
R M50.1

Question is would these 3 lines change the RLO state:
OPN DB [#db_Num]
L P#DBX 0.0
LAR1
?

No. But why would you mess it up by putting all that inbetween?

Kalle

KalleOlsen said:

No. But why would you mess it up by putting all that inbetween?

Kalle

Click to expand...

Good question, well in STL
I have to very often work with 2 DBs

So I keep doing codes like this
OPN DB1
L P#DBX 0.0
LAR1

Here is 1 example
OPN DB488
L #state1
LAR1
L #state2
LAR2

ON [AR1,P#0.0]
ON [AR2,P#0.0]
= L 19.0
A L 19.0

JNB _007
OPN DB [#db_Num](DBs from 61 to 66)
L P#DBX 0.0
LAR1


= [AR1,P#0.0]
R [AR1,P#0.1]
...
...

_007: NOP 0

when i do something with another DB, then i do this
OPN DB2
L P#DBX 0.0
LAR1

To conditionally open the DB, you would have to put in a Jump after the first line.

Click on an instruction and then press F1, the help will tell you if the instruction affects the RLO.

If you are using FCs then you can make use of the two DB registers. You can also load address registers directly.

e.g.