Convert Byte to DINT

byronp2 · Oct 2, 2010

Hi

This may be a stupid question but in Step 7 is it possible to convert a byte to a Double Integer

eg convert DB*.DBB* to DB*.DBD*

Your help is appreciated.

L D[AR2P#0.0] · Oct 2, 2010

Is the byte a signed or unsigned value ?

KalleOlsen · Oct 2, 2010

If the byte is allways positive (0-255), do like this;
L DB*.DBB*
T DB*.DBD*

If it's a signed byte (-128 to 127), do it like this:
L DB*.DBB*
SLD 24 // Move the byte to leftmost byte in akku
SSD 24 // Move the byte back with sign
T DB*.DBD*

Kalle

byronp2 · Oct 2, 2010

Hi Thanks for the replies

It is always positive ie date and time

L D[AR2P#0.0] · Oct 2, 2010

How can the date and time be stored in a byte ?

byronp2 · Oct 2, 2010

Byte 0 Year 90 ... 89 (from 1990 to 2089)
Byte 1 Month 01 to 12
Byte 2 Day 1 to 31
Byte 3 Hour 0 to 23
Byte 4 Minute 0 to 59
Byte 5 Second 0 to 59
Byte 6 2 MSD of ms 00 to 99
Byte 7 (4 MSB) LSD of ms 0 to 9
Byte 7 (4 LSB) Day of week 1 to 7 (1 = Sunday)

What I need to do is move each of these 7 bytes to Double Intergers. When I do it for the year for example I get 16 instead of 2010

L D[AR2P#0.0] · Oct 2, 2010

The date and time information is stored in BCD format.

byronp2 · Oct 2, 2010

So is it possible to do what I want to do?

KalleOlsen · Oct 2, 2010

Try this:

L DB*.DBB*
BTI
T DB*.DBD*

Special for millisecs:

L DB*.DBW6
SRW 4
BTI
T DB*.DBD*

Special for dow:

L DB*.DBB7
AW W#16#F
T DB*.DBD*

(Didn't test it)

Kalle

byronp2 · Oct 2, 2010

Thanks Kalle

I am nearly there. this works fine but I am getting 10 for the year instead of 2010. How do I get the 2010.

Regards and much appreciated

bernie_carlton · Oct 2, 2010

According to the table the century is implied. You'll have to add it in yourself.

L D[AR2P#0.0] · Oct 2, 2010

byronp2 said:
...I am nearly there...

Why are you storing variables than can be represented by INT as DINT ?

byronp2 · Oct 3, 2010

This is code written by one of our vendors and i am stuck with.

thanks for all the help.

Convert Byte to DINT

byronp2

Member

L D[AR2P#0.0]

Lifetime Supporting Member

KalleOlsen

Member

byronp2

Member

L D[AR2P#0.0]

Lifetime Supporting Member

byronp2

Member

L D[AR2P#0.0]

Lifetime Supporting Member

byronp2

Member

KalleOlsen

Member

byronp2

Member

bernie_carlton

Lifetime Supporting Member + Moderator

L D[AR2P#0.0]

Lifetime Supporting Member

byronp2

Member

Similar Topics