filtering a bit away in S7 STL

userxyz

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• Aug 15, 2007

• #1

I have alarms from Input I8.0 until I9.6

I9.7 is something else

I wrote this as code, M20.0 is a horn.

Code:

	  L	 IW	 8
	  CAW   
	  SLW   1
	  L	 0
	  <>I   
	  =	 M	 20.0

...

 

gregoryg

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• Aug 15, 2007

• #2

Maybe..
L IW8
AW W#16#FF7F
L 0
<>I
= M20.0

 

L D[AR2P#0.0]

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• Aug 15, 2007

• #3

Boolean logic would be my choice,

Code:

O I 8.0
O I 8.1
O I 8.2
..
..
O I 19.6
= M 20.0

If there is a momentary input the horn will not sound but (I'm presuming here) you will get a HMI alarm message ?

 

jacekd

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• Aug 16, 2007

• #4

gregoryg said:

Maybe..
L IW8
AW W#16#FF7F
L 0
<>I
= M20.0

Click to expand...

Or even more confusing

L IW8
AW W#16#FF7F
A <>0
= M20.0

 

aikona

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• Aug 16, 2007

• #5

Another way

L IW8
L 2#11111110 11111111 Bit 8 byte 2 is ignored
AW
T #temp // not required
L #temp // not required
L 0
<>I
= M 20.0

 

L D[AR2P#0.0]

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• Aug 16, 2007

• #6

Here's a cloudy implementation.

Code:

	  L	 DW#16#81000040
	  LAR1  
	  L	 W [AR1,P#0.0]
	  LAR1  P##wTemp
	  T	 W [AR1,P#0.0]
	  SET   
	  R	  [AR1,P#1.7]
	  L	 W [AR1,P#0.0]
	  L	 0
	  <>I   
	  L	 DW#16#830000A0
	  LAR1  
	  =	  [AR1,P#0.0]

 

jacekd

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• Aug 16, 2007

• #7

aikona said:

L 2#11111110 11111111

Click to expand...

It should be 2#11111111 01111111 to mask I9.7 out.

BTW, "bit 8 byte 2" is a little bit confusing as common understanding is that bits in a byte are 0-7.

 

aikona

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• Aug 16, 2007

• #8

jacekd said:

It should be 2#11111111 01111111 to mask I9.7 out.

BTW, "bit 8 byte 2" is a little bit confusing as common understanding is that bits in a byte are 0-7.

Click to expand...

Oops ... yes the idea was to : Byte 1 , Byte 0 and 00000001 bit 0 is 1

That my daily mistake quota used up.Well some people do read the stuff