Hex

Is there a way to display a hex number on a panelview plus? I dont want to convert it to a decimal, but when I use a numeric display this is what is does.

thanks for anyones help

Nope, no way without a lot of work. PV+ doesn't provide any method of supplying a numeric format.

Maybe you could write an ActiveX control.

I'd say use a 'Local Message Display', but in Rockwells less than infinate wisdom, they do not allow values of 0 as an index in LMD's.

thanks, thats what I thought. I just wanted to show the devicenet message display on the scanner card on the HMI but if I have to do all that work they can just open the panel and look at the scanner card. Thanks again

Oh, well, for DeviceNet scanner messages, you could actually do with a Local message display, as the number of status codes is fairly small, and within bounds of the message list.

Really, there are what, 30? Status messages that you could expect to get, bounded from around 65 to 100 or so. And actual text is much better than a number, especially as it will be decoded on the PV+, so it doesn't result in any message traffic overhead.

rdrast has it right. With many customers adopting arcflash safety procedures, its a PITA to open a panel door anymore.

Blast from the past.
Ken Roach had this solution.
http://www.plctalk.net/qanda/showpost.php?p=37798&postcount=13

I'm lost, but I think that it might work for you?

As George (Ken) indicated (...I think), you have to "construct" the displayed value.

If the display doesn't display Hex, as you indicated... (it converts the value to Decimal)...

Then take the Hex value and use a Hex>Dec function to convert it to Decimal.

Then... assuming a 16-bit word... consisting of 4-nibbles (each consisting of 4-bits)...

Grab the MSN (Most Significant Nibble) and read it as a decimal version. Then use that value as an index into a table so you can grab a pointer to a "Character" in your display program memory. The MSN is Digit-1... the LSN is Digit-4 (LSN = Least Significant Nibble). When you grab and interpret the first Nibble (convert it from a simple decimal value to an Index Value), save the value as the Pointer to Digit-1.

Surely you must be able to store a set of characters in your display handler? And surely... you must have a way to grab a particular nibble??? If not, you can do the painful exercising of masking and shifting.

One way or another, grab a nibble and read it as a simple decimal value. Then use that simple value as an Index into a Table.

Table Base + Index = Pointer to memory location of the particular character.

0 => Pointer to "0"
1 => Pointer to "1"
2 => Pointer to "2"
3 => Pointer to "3"
4 => Pointer to "4"
5 => Pointer to "5"
6 => Pointer to "6"
7 => Pointer to "7"
8 => Pointer to "8"
9 => Pointer to "9"
10 => Pointer to "A"
11 => Pointer to "B"
12 => Pointer to "C"
13 => Pointer to "D"
14 => Pointer to "E"
15 => Pointer to "F"

Digit-1, Digit-2, Digit-3, Digit-4

Where Digit-1 is the MSN and Digit-4 is the LSN.

Example...

1234(Decimal) => 0000-0100-1101-0010(Bin)

0000 is the MSN, Digit-1. 0010 is the LSN, Digit-4.

Nibble-1 = 0000, Digit-1 = 0, Index = 0, Character = "0"
Nibble-2 = 0100, Digit-2 = 4, Index = 4, Character = "4"
Nibble-3 = 1101, Digit-3 = 13, Index = 13, Character = "D"
Nibble-4 = 0010, Digit-4 = 2, Index = 2, Character = "2"

Then it is simply a matter of assigning Digit-1 to a particular place on your display, followed by Digit-2, etc.

Then, with Digit-1 along side of Digit-2, along side of Digit-3, along side of Digit-4... you have "constructed" the appropriate Hex Value for display.

There are several technotes on the AB website about how to convert a Hex number to a string. Then you can display the string on the PV+.

They mostly all work on the same principle: deconstruct the 16 bit integer into 4 4 bit fields (nibbles - a half byte), then use a 16 character lookup table to construct the string based on the value of each nibble.

http://domino.automation.rockwell.c...54?OpenDocument

http://domino.automation.rockwell.c...81?OpenDocument

http://domino.automation.rockwell.c...F5?OpenDocument

http://domino.automation.rockwell.c...42?OpenDocument


edit: Thats pretty much the method Terry explained as well. The first technote actually has a sample PLC program attahced.