S5 pos edge detection

Fritz_frederix · Feb 17, 2005

Hello,

I'm strugling with an positive edge detection on an Siemens S5 PLC.

I know how it should be programmed in ladder but how do you draw it in the step 5 software?



   I 0.0     F0.0    F1.0

I---II--------I/I-----()--I

            I        F0.1

            I---------()--I

But there is, if I recall correct, an instruction that uses the # symbol.

Anyone

Fritz_frederix · Feb 17, 2005

Hello,

F0.1 should be F0.0.

sorry

moggie · Feb 17, 2005

Try the following F0.1 is the positive edge detection for I0.0

seg 1

A I0.0
AN F0.0
= F0.1
****
seg 2

A I0.0
= F0.0
***
seg 3 (etc)

RolfB · Feb 17, 2005

Hello,

or use the 'classic' one like this

Regards

Rolf

moggie · Feb 17, 2005

Another way is as follows...

SEG 1
A I0.0
AN F0.1
= F0.0
A F0.0
S F0.1
AN I0.0
R F0.1
NOP 0
***

The above will convert back to ladder

The (#) in ladder is usually F9?

Fritz_frederix · Feb 17, 2005

Thank you all,

But my input signal is inverterd

Can I invert the I0.0?

an i0.0
an f0.1
= f0.0
a f 0.0
s f0.1
a i0.0
r f0.1
nop 0
***

Fritz_frederix · Feb 17, 2005

Hello,

Thank you all for the info, it works nice.

Rudi

S5 pos edge detection

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