RSLogix 5000 help BAND

shady2 · Mar 30, 2012

Hi
I am trying to figure out how to decode the following logic block
I understand what the block is trying to do, but do not know how to convert the data type of source B, in order to trace which values of source A is being processed.

Help will be appreciated

rdrast · Mar 30, 2012

What are you trying to "decode"?
That is just masking (Logical ANDing) DINT alarm words, with constant DINT values.
Then if any result is non-zero, something else happens that you don't show.

shady2 · Mar 30, 2012

Basically it activates a coil.
What I actually wanted to know was eg.
how is "4095" converted to the format 2#0000_ ...... ,etc
this would allow me to detect which bits in the latch will activate the coil when it changes state.
Not sure of the data types and conversions. Did decimal to binary conversion, but the result doesn't make sense.
Thus I know my conversion method is wrong
Hope this makes it more clearer.

rdrast · Mar 30, 2012

All numbers are stored in binary on current computing platforms. What conversion are you talking about?
In ControlLogix terms:
2#xxx... indicates a number represented in base 2.
16#xxx... indicates a number represented in base 16.
There is no prefix for base 10.

2#1111 = 16#f = 15

shady2 · Mar 30, 2012

rdrast said:
All numbers are stored in binary on current computing platforms. What conversion are you talking about?
In ControlLogix terms:
2#xxx... indicates a number represented in base 2.
16#xxx... indicates a number represented in base 16.
There is no prefix for base 10.

2#1111 = 16#f = 15

Thanks for the help
So if I am correct 4095 = 2#111111111111
... and if that is the case, the current logic in the program I'm looking at is incorrect, which is why I was so confused

rdrast · Mar 30, 2012

shady2 said:
Thanks for the help
So if I am correct 4095 = 2#111111111111
... and if that is the case, the current logic in the program I'm looking at is incorrect, which is why I was so confused

Yes, 4095 = 2#1111 1111 1111
It is one less then 2^12 which is:
4096 or 2#1 0000 0000 0000

As an aside, if you want to look at various representations inside or RSLogix, just create a DINT tag in the tag editor, and enter a value under the Monitor Tags tab. The style dropdown to the right of the value will let you see the numeric value you enter in decimal, binary, octal, hex, or ascii.

daba · Mar 30, 2012

It would have been so much clearer if the Source B operands had been entered as Binary notation....

rdrast · Mar 30, 2012

daba said:
It would have been so much clearer if the Source B operands had been entered as Binary notation....

It would have been even automatic, if instead of using hard coded constants, they used a tag. If it really MUST be constant, then you can always set the "Constant" box in the tag properties. (Version 18+? 19+?)

daba · Mar 30, 2012

rdrast said:
It would have been even automatic, if instead of using hard coded constants, they used a tag. If it really MUST be constant, then you can always set the "Constant" box in the tag properties. (Version 18+? 19+?)

Agreed, but not entirely "automatic" - you would have to set the tag display properties to "Binary" when creating them.

daba · Mar 30, 2012

I have actually made a mistake in my posted image....

The middle rung Source B was 2,147,483,647 - which of course is ..
2#0111_1111_1111_1111_1111_1111_1111_1111 and not..
2#1111_1111_1111_1111_1111_1111_1111_1111 as I posted.

If all 1's were required, then Source B should have been -1

daba · Mar 30, 2012

The "constant" tag attribute was introduced in Version 18

RSLogix 5000 help BAND

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