RSLogix Binary to DEC

KLemas16! · Jan 24, 2017

Good morning,

Still new-ish to Allen Bradley and hoping some of you seasoned folks out there could help me.

I am setting up communication with a Mettler Toledo weight scales. Five bits (bits 8-12) of a 16 bit input word are used to communicate a particular weight mode (gross, net, tare, target, etc.) that is being reported by the scale interface. I need to get the decimal value of these five bits to determine which weight mode is being communicated. What would be the simplest way to do this? My ideas right now seem convoluted.

I am using ladder logic in RSLogix 5000 for this interface. Thanks in advance for any help.

widelto · Jan 24, 2017

Have you tried to mask 16 your bits data and send results to a decimal number, you will need to mask out 0-7 and 13-15 bits.

Bullzi · Jan 24, 2017

I was thinking the same thing as Widelto. Use a Masked Move command to a INT or DINT register.

You could also use individual move commands and when bit 8 is true then move a 1 into a register. If bit 9 is true move a 2 and so on.

thingstodo · Jan 24, 2017

KLemas16! said:
Good morning,

Still new-ish to Allen Bradley and hoping some of you seasoned folks out there could help me.

I am setting up communication with a Mettler Toledo weight scales. Five bits (bits 8-12) of a 16 bit input word are used to communicate a particular weight mode (gross, net, tare, target, etc.) that is being reported by the scale interface. I need to get the decimal value of these five bits to determine which weight mode is being communicated. What would be the simplest way to do this? My ideas right now seem convoluted.

I am using ladder logic in RSLogix 5000 for this interface. Thanks in advance for any help.

I would use bit distribute (BTD)

The arguments are:
Source - The tag that contains your raw data.
Source bit - in your case 8
Destination - The tag that you want your result in. The supported types are again Sint (8 bits), Int (16 bits) or Dint (32 bits)
Destination bit - 0
Length - 5

That should do it for you.

If it were my program, I'd make sure that the number from the Mettler stays stable for half a second to verify that the bits are stable before you process your logic.

OkiePC · Jan 24, 2017

thingstodo said:
I would use bit distribute (BTD)

The arguments are:
Source - The tag that contains your raw data.
Source bit - in your case 8
Destination - The tag that you want your result in. The supported types are again Sint (8 bits), Int (16 bits) or Dint (32 bits)
Destination bit - 0
Length - 5

That should do it for you.

If it were my program, I'd make sure that the number from the Mettler stays stable for half a second to verify that the bits are stable before you process your logic.

+1

And to clarify, this would move those five bits to a new tag in bits zero through four which I believe will match up with your needs better than a MVM which would leave the bit positions unchanged.

KLemas16! · Jan 24, 2017

Thank you all for the response. It seems the BTD is the cleanest and easiest way to do this. Nice block for the tool bag

I've attached an image showing my old rather manual way vs. the BTD function. Maybe someone will learn from this in the future.

All the best!

RSLogix Binary to DEC

KLemas16!

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widelto

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Bullzi

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thingstodo

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OkiePC

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KLemas16!

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