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ibisjoe
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are there variables available to tell me WHICH CPLC or Script PLC I am when I am executing? I see everyone just using constants but it would seem that the system KNOWS which CPLC or Script PLC is executing so can I just obtain that information (I have axis CPLCs coded in a subroutine and to check the 'bgcplc[n]' flags you need to have that information).

- Joe

 

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The easiest way (as far as I know) is to just put a global flag inside your CPLC to go high when the CPLC is running.

 

I.e. you can define a global in your "global definitions.pmh" file as, for example:

 

global CPLC1_Running, CPLC2_Running;

 

and then in your CPLC you can just set

 

pshm->P[CPLC1_Running]=1;

 

when the CPLC starts, and set it to zero right before the CPLC ends, and so on.

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no...I want to know the INDEX to use for manipulating the 'pshm->UserAlgo.BgCplc[iNDEX]' variables, etc. and similar for the Script PLCs.

- Joe

 

The easiest way (as far as I know) is to just put a global flag inside your CPLC to go high when the CPLC is running.

 

I.e. you can define a global in your "global definitions.pmh" file as, for example:

 

global CPLC1_Running, CPLC2_Running;

 

and then in your CPLC you can just set

 

pshm->P[CPLC1_Running]=1;

 

when the CPLC starts, and set it to zero right before the CPLC ends, and so on.

 

 

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I would be interested to know if there is a simple system variable for this too. Currently I use the following define at the top of the file which isn't too bad

 

#define THIS_PLCC 3

 

and then use

 

SetPmacVar((char *)"UserAlgo.BgCplc[THIS_PLCC]", 0);

 

to self-disable.

 

Also I think you should know I had various crashes after manipulating pshm->UserAlgo.BgCplc[iNDEX] in C code (reading is OK) and was told to use the above syntax (see post http://forums.deltatau.com/showthread.php?tid=604&pid=2128&mode=threaded for a good discussion on this and other CPLC flow control issues.

 

If you really need a generic method, a messy option for CPLCs (I guess not PLCs) may be to parse the __FILE__ macro which gives "bdccplc03.c" etc on my system, assuming you haven't renamed the file...?

 

Dave

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The index is just the PLC or CPLC number.

 

e.g. bgcplc01 in your IDE's Solution Manager corresponds to pshm->UserAlgo.BgCplc[1]

 

So, you could just put at the top of your bgcplc01.c (for example) file:

 

#define THIS_CPLC 1

 

as the previous poster suggested. Then, to deactivate your CPLC, in your code below, you could do something like this:

 

char buffer[64]="";
sprintf(buffer,"UserAlgo.BgCplc[%d]",THIS_CPLC);
SetPmacVar(buffer,0);

 

 

 

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Oops, my Friday brain wrote that second line of code which doesn't actually do anything. In reality I have a global utilities h file with amongst other things

 

void DoPLCC(int PLCC, int Value)
{
char buffer[25];

sprintf(buffer, "UserAlgo.BgCplc[%d]", PLCC);
SetPmacVar(buffer, Value);
}

void DisablePLCC(int PLCC) {DoPLCC(PLCC, 0);}
void EnablePLCC(int PLCC) {DoPLCC(PLCC, 1);}

 

So I can just call

 

DisablePLCC(THISPLCC);

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