Using NX-PG0232-5 to control Stepper Motor (NJ PLC)

[ragzz1995 0]

Hello,

I need to control a stepper motor(have stepper driver) using NX-PG0232-5 with NJ301 PLC. The function is simple, i need to run the stepper motor continuously at a specified velocity. So, in NX-PG module I've made the settings (Ch1 output mode as "Velocity continuous pulse output") and given the tags to IO (as shown below, sorry i'm not able to attach image). I've also added the initialization program to switch on the vfd. Now to move continuously i should should just give speed in pps in "PG_Ch1_Command_Velocity" right? 

    Ch1 Controlword    Control word 1    W    WORD            
    Ch1 Switch On    Switch ON for pulse output 1    W    BOOL    PG_Ch1_SwitchOn        Global Variables
    Ch1 Enable Voltage    Start turning on the power for pulse output 1.    W    BOOL    PG_Ch1_Enable_Voltage        Global Variables
    Ch1 Quick Stop    Immediate stop for pulse output 1    W    BOOL    PG_Ch1_QuickStop        Global Variables
    Ch1 Enable Operation    Start operation for pulse output 1    W    BOOL    PG_Ch1_EnableOperation        Global Variables
    Ch1 Fault Reset    Reset errors for pulse output 1    W    BOOL            
    Ch1 External Output    Aggregated data of external outputs for pulse output 1    W    BYTE            
    Ch1 Command Position    Command position of pulse output 1    W    DINT    PG_Ch1_Command_Position        Global Variables
    Ch1 Command Velocity    Command velocity of pulse output 1    W    DINT    PG_Ch1_Command_Velocity        Global Variables
 

Edited 15 Sep 2020 by ragzz1995

[Crossbow 295]

Haven't worked with it in a while, but pretty sure there's a bit in the control word to turn it on.  Check manual W524.

[ragzz1995 0]

I'm able to run the motor but i have to give position and velocity. How do i run continuously? (Do i have to keep incrementing the position ?? Seems like it ain't right though)

[Crossbow 295]

What motion instruction are you using to cause the move?  MC_MoveVelocity will make a speed controlled axis, and doesn't need a position.

I never move a motion axis using the variables in the IO map... Configure your motion axis and use the motion function blocks.

[ragzz1995 0]

So I have to assign an axis to NX-PG and the move the stepper motor using MC_MoveVelocity??

[Crossbow 295]

That's how I do it.  Why reinvent the wheel, the motion commands are built in.

[ragzz1995 0]

Working. Thanks!