Merging DI to GI

VictorAx

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...

lemster68

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?

Paba

Did you took a look at "BitSet"/"BitClear" Instruction?

VictorAx

lemster68 said:

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?

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].

VictorAx

Paba said:

Did you took a look at "BitSet"/"BitClear" Instruction?

Yes, but I'd like to be able to use Set/Reset "Handshake.X0" instead to make it more "readable"...

Slokko

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

?

SomeTekk

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

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

nDataConversion:=gi_BitExtract;

by_dataStorage:=nDataConversion;

stBytes:=ByteToStr(by_dataStorage\Bin);

EricH

For readability, you can use a Routine

For example:

PROC Set_Handshake_X0()<br>  BitSet ...<br>ENDPROC
PROC SetHandshakeX0()<br>  BitSet ...<br>ENDPROC<br><br>OR<br><br>