Merging DI to GI

RAPID Programming
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1

Hello,

I am trying to make a record with 8 signaldis, which I want to split from an signalgi. In PLC code, I often make a word with handshakes and I assign values to the individual bits (e.g. handshake.%X0 := TRUE;).

Is it possible to do anything like this in the robot? I was thinking maybe you could use AliasIO (e.g. AliasIO BitInByte(Handshake,1), Handshake.X0;) but with no luck…

2

Are you wanting the record to be like 0,1,0,0,1,0,0,1? or to hold the actual value of the group?

3

Did you took a look at “BitSet”/“BitClear” Instruction?

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4

Yes I want to split the signal without having 8 individual bits in the IO configuration.
So for example the input Handskake should be an GI which holds the value 20, and then I want my record to hold the values [0,0,0,1,0,1,0,0].

5

Yes, but I’d like to be able to use Set/Reset “Handshake.X0” instead to make it more “readable”…

6

If you want to assign individual bitvalues with Set/Reset, then you will have to define them as individual DOutputs in the IO-config.

Also with some clever named Constants, and a wrapper-routine, how much less readable is

SetBit HANDSHAKE, X0;
to
Set Handshake.X0
?

7

Here’s a low tech start for parsing the GI to get discrete 1’s & 0’s [ in a string :s ]

VAR num nDataConversion;
VAR byte by_dataStorage;
VAR stringdig stBytes;

nDataConversion:=gi_BitExtract;
by_dataStorage:=nDataConversion;
stBytes:=ByteToStr(by_dataStorage\Bin);

8

For readability, you can use a Routine
For example:

PROC SetHandshakeX0()
  BitSet ...
ENDPROC

OR

PROC Set_Handshake_X0()
  BitSet ...
ENDPROC