Always get errors trying to control power 7651 YOKOGAWA on Labwindows/CVI

Hello

I'm trying to set the voltage on YOKOGAWA 7651 feeding through labwindows/cvi. I've set up a digital slide on my UI with callback function "yoko7651dcvolts" and the name of the constant "YOKO7651DCVOLTS".

I always get this error when I run my program:

"FATAL RUN-TIME ERROR: "DcSource.c", line 53, col 65, thread id 0x00001F3C:   Invalid argument type: found 'pointer to double', expected 'pointer to int'."

This error indicates the third argument to the GetCtrlVal function below. The lack of program/compiler pass the variable "yoko1volts" as a whole, but I want to (and should) be able to settle the tensions as floating numbers.

Of more, even when I said "yoko1volts" as a whole, it stills does not work. All I get is zero, zero and zero... on the power meter whenever I press the digital slide.

This is the section of the C code which is problemic:

int CVICALLBACK yoko7651dcvolts (int panel, int control, int event,        void *callbackData, int eventData1, int eventData2){    double yoko1volts;    switch (event)    {        case EVENT_COMMIT:        GetCtrlVal (yoko76511Panel, YOKO7651_1_YOKO7651DCVOLTS, &yoko1volts); // to read the values entered on the numerical meter on the user interface

        yk7651_set_volts (yoko76511Panel, yoko1volts); // set the entered values as voltage on the instrument

        break;    }    return 0;}

It's the h-file related:

#define  YOKO7651_1                       4#define  YOKO7651_1_YOKO7651SWITCH        2       /* control type: binary, callback function: yoko7651switch */#define  YOKO7651_1_YOKO7651DCVOLTS       3       /* control type: scale, callback function: yoko7651dcvolts */

Please help, how can I solve this problem?

All pilots (including feeding YOKOGAWA 7651) are correctly installed and mounted. In fact, I can successfully turn the power supply on and off with the code below:

int CVICALLBACK yoko7651switch (int panel, int control, int event,        void *callbackData, int eventData1, int eventData2){    int yoko7651switchstate;    switch (event)    {        case EVENT_COMMIT:        GetCtrlVal (yoko76511Panel, YOKO7651_1_YOKO7651SWITCH, &yoko7651switchstate);        SetCtrlVal (yoko76511Panel, YOKO7651_1_YOKO7651SWITCH, !yoko7651switchstate);        yk7651_output (yoko76511Panel, !yoko7651switchstate);            break;    }    return 0;}

It is just setting the voltage on the power supply which is very problematic. Any help is appreciated... Thank you.

I second opinion Al of a disconnection between the UIR and the variable that contains the handle to the Panel.

As a side note, I noticed that the problematic line reads the value of the controll which callback is executed:

#define  YOKO7651_1_YOKO7651DCVOLTS       3       /* control type: scale, callback function: yoko7651dcvolts */

int CVICALLBACK yoko7651dcvolts (int panel, int control, int event,        void *callbackData, int eventData1, int eventData2){    double yoko1volts;    switch (event)    {        case EVENT_COMMIT:        GetCtrlVal (yoko76511Panel, YOKO7651_1_YOKO7651DCVOLTS, &yoko1volts); // to read the values entered on the numerical meter on the user interface

        yk7651_set_volts (yoko76511Panel, yoko1volts); // set the entered values as voltage on the instrument

        break;    }    return 0;}

In a situation like this, I will try using GetCtrlVal (Panel, control, & yoko1volts); Instead, which should get rid of all the problems in the control panel manage / control ID.

Despite this solution works, anyway I'd be deep into the problem like a bad Panel can lead to erratical behaviors in other parts of the program.

Tags: NI Software

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