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100

PMAC 2 Software Reference

PMAC I-Variable Specification 73

Ix15 Motor x Deceleration Rate on Position Limit or Abort

Range

positive floating point

Units

Counts/msec

Default

0.25

Remarks

WARNING:

Do not set this parameter to zero, or the motor will continue

indefinitely after an abort or limit.

Ix15 sets the rate of deceleration that Motor x will use if it exceeds a hardware or software

limit, or has its motion aborted by command (A or <CONTROL-A). This value should

usually be set to a value near the maximum physical capability of the motor. It is not a

good idea to set this value past the capability of the motor, because doing so increases the

likelihood of exceeding the following error limit, which stops the braking action, and could

allow the axis to coast into a hard stop.

Example

Suppose your motor had 125 encoder lines (500 counts) per millimeter, and you wished it

to decelerate at 4000 mm/sec

. You would set Ix15 to 4000 mm/sec

*500 cts/mm *

sec

/1,000,000 msec

= 2 cts/msec

See Also

On-line commands A, <CONTROL-A>

Hardware Overtravel Limits, Software Overtravel Limits (Making Your Application Safe)

Ix16 Motor x Maximum Permitted Motor Program

Range

positive floating point

Units

Counts/msec

Default

32.0

Remarks

Ix16 sets a limit to the allowed velocity for LINEAR mode programmed moves for Motor

x, provided I13 equals zero (no move segmentation). If a blended move command in a

motion program requests a higher velocity of this motor, all motors in the coordinate

system are slowed down proportionately so that Motor x will not exceed this parameter,

yet the path will not be changed. This limit does not affect transition-point, circular, or

splined moves. The calculation does not take into account any feedrate override value

other than 100).

Note:

If PMAC’s circular interpolation function is used at all, then I13

must be greater than zero, and Ix16 will not be active as a velocity

limit.

This parameter also sets the speed of a programmed RAPID mode move for the motor,

provided that variable I50 is set to 1 (if I50 is set to 0, jog speed parameter Ix22 is used

instead). This happens regardless of the setting of I13.

With the Option 6L special lookahead firmware, Ix16 sets the limit for velocity of

LINEAR and CIRCLE mode moves with segmentation active (I13 > 0).