164 ● MF DMC-40x0 Command Reference
MF
FUNCTION: Forward Motion to Position
DESCRIPTION:
The MF command is a trippoint used to control the timing of events. This command will hold up
the execution of the following command until the specified motor moves forward and crosses
the position specified*. The units of the command are in quadrature counts. Only one axis
may be specified at a time. The MF command only requires an encoder and does not require
that the axis be under servo control.
* When using a stepper motor, this condition is satisfied when the stepper position (as determined
by the output buffer) has crossed the specified Forward Motion Position. For further
information see Chapter 6 of the User Manual “Stepper Motor Operation”.
ARGUMENTS: MF n,n,n,n,n,n,n,n or MFA=n where
n is a signed integer in the range -2147483648 to 2147483647 decimal
USAGE: DEFAULTS:
While Moving Yes Default Value -
In a Program Yes Default Format -
Command Line No
Controller Usage
ALL CONTROLLERS
RELATED COMMANDS:
AR Trippoint for after Relative Distances
AP Trippoint for after Absolute Position
EXAMPLES:
#TEST ;'Program Test
DP0 ;'Define zero
JG 1000 ;'Jog mode (speed of 1000 counts/sec)
BG A ;'Begin move
MF 2000 ;'After passing the position 2000
V1=_TPA ;'Assign V1 A position
MG "Position is", V1 ;'Print Message
ST ;'Stop
EN ;'End of Program
Hint: The accuracy of the MF command is the number of counts that occur in 2*TM
μ
sec. Multiply the
speed by 2*TM
μ
sec to obtain the maximum error. MF tests for absolute position. The MF command can
also be used when the specified motor is driven independently by an external device.
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