Input - VXI VT1422A User Manual

/* on 'n', where n is the algorithm number (as returned by ALG_NUM, for*/
/* example). The first value is placed in the (10 * n)th 32-bit word of
/* the CVT. The other values are written in subsequent locations.
/*
/* History_mode = 0: Summary to CVT only. In this mode, four values */
/* are output to the CVT.
/*
/* Location
/*
/*
/*
/*
/*
/* History_mode = 1: Summary to CVT and FIFO. In this mode, the four*/
/* summary values are written to both the CVT and FIFO. A header
/* tag (256 * n + 4) is sent to the FIFO first, where n is the Algorithm
/* number (1 - 32).<N>
/*
/********************************************************************************************/
/*
/* User determined control parameters
static float Setpoint = 0; /* The setpoint
static float P_factor = 1; /* Proportional control constant
static float I_factor = 0; /* Integral control constant
static float D_factor = 0; /* Derivative control constant
static float Error_max = 9.9e+37; /* Error alarm limits
static float Error_min = -9.9e+37;
static float PV_max = 9.9e+37; /* Process Variable alarm limits
static float PV_min = -9.9e+37;
static float Out_max = 9.9e+37; /* Output clip limits
static float Out_min = -9.9e+37;
static float D_max = 9.9e+37; /* Derivative clip limits
static float D_min = 9.9e+37;
static float I_max = 9.9e+37; /* Integral clip limits
static float I_min = -9.9e+37;
static float Man_state = 0; /* Activates manual control
static float Man_out = 0; /* Target Manual output value
static float Man_inc = 9.9e+37;/* Manual output change increment
static float SD_factor = 0; /* Setpoint Derivative constant
static float SD_max = 9.9e+37; /* Setpoint Derivative clip limits
static float SD_min = 9.9e+37;
static float History_mode = 0; /* Activates fifo data logging
/*
/* Other Variables
static float I_out; /* Integral term
static float D_out; /* Derivative term
static float Error; /* Error term
static float PV_old; /* Last process variable
static float Setpoint_old; /* Last setpoint - for derivative
static float SD_out; /* Setpoint derivative term
static float Status = 0; /* Algorithm status word
/*
496 Example PID Algorithm Listings
Value
0

Input

1 Error
2 Output
3 Status
/*
/* B0 - PID_out at clip limit
/* B1 - I_out at clip limit
/* B2 - D_out at clip limit
/* B3 - SD_out at clip limit
/* B4 - in Manual control mode
/* B5 - Error out of limits
/* B6 - PV out of limits
/* others - unused
/*
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
Appendix G