Product : 3.23
Date : 30-April-1998
File : pid_alnt.using pid_al.c with isagraf nt target.htm
Subject : Using PID_AL.C with ISaGRAF NT target
Keywords: PID_AL - NT target
When you compile pid_al.c in order to build the ISaFBL library and
then link it to ISaGRAF kernel for generating of a new kernel
executable, the following error is generated:
cannot export LAST-DATE to ISaFBL.DLL.
LAST_DATE is declared in pid_al.c as an external variable, it's
defined in Tasy0tcy.c.
But as on NT, you've got an executable for kernel and a DLL for your
C function blocks, you would need to access from a DLL a data stored
1st solution would have been to declare, in executable, LAST_DATE
as an exported variable.
We've choosen to export a function (called sys_get_lastdate) instead
of exporting a global variable.
To solve the problem you have, in pid_al.c, to make the following
- remove the line :extern unsigned long LAST_DATE.
- in the function FBACT_pid_al(...) insert the following definitions:
last_date = sys_get_lastdate();
and then replace, in the remainder of the file, each LAST_DATE
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