Rockwell Automation 2098-IPD-xxx Ultra5000 C Programming using the Motion Library - Manual (Page 22)

Publication 2098-PM001E-EN-P — July 2002
1-10 Programming Motion Control in C
Example 2.3 - Another Variance of the Program using Variables
A third way to achieve the same result is to write the program as
follows:
#include <motion.h>
#define ACCEL 2000 /* counts/second**2 */
#define DECEL 2000 /* counts/second**2 */
#define TARGETVEL 1000 /* counts/second */
#define INDEX 1000 /* counts */
#define ENDPOINT 10000 /* counts */
/* increment through the 10 index positions 1000, 2000,...,
until target > endpoint */
int main (void)
{
long target;
InitMotionLibrary();
AxisEnable();
MoveSetAcc(ACCEL);
MoveSetVel(TARGETVEL);
MoveSetDec(DECEL);
AxisDefinePos(0);
for (target = INDEX; target <= ENDPOINT; target = target +
INDEX) {
MoveAbsolute(target);
while (MoveInProgress()) {/* loop */}
}
AxisDisable();
return 0;
}
Example 2.3 Explained
The quantities ACCEL, DECEL, TARGETVEL, INDEX, and ENDPOINT
are symbolic constants, not variables, so they do not appear in
declarations. C programming conventions write constants in upper
case and variables in lower case, but this is not a requirement. Notice
that there is no semicolon at the end of a #define line.