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Command, function and parameter description
Section 6-3
Arguments:
sequence
Precautions:
The origin input set with the DATUM_IN parameter is active low, i.e., the ori-
gin switch is set when the input is OFF. The feedhold, reverse jog, forward
jog, forward and reverse limit inputs are also active low. Active low inputs are
used to enable fail-safe wiring.
See also:
ACCEL, AXIS, AXISSTATUS, CREEP, DATUM_IN, DECEL,
MOTION_ERROR, SPEED
6-3-49
DATUM_IN
Type:
Axis Parameter
Alternative:
DAT_IN
Description:
The DATUM_IN axis parameter contains the input number to be used as the
datum switch input for the DATUM command. The valid input range is given
by 0 to 7. If DATUM_IN is set to –1, then no input is used as the datum switch
input.
Precautions:
The origin input is active low, i.e., the origin switch is set when the input is
OFF. The feedhold, reverse jog, forward jog, forward and reverse limit inputs
are also active low. Active low inputs are used to enable fail-safe wiring.
See also:
AXIS, DATUM
Example:
DATUM_IN AXIS(0) = 5
0
The DATUM(0) command will clear the motion error. The currently
measured position is set as the demand position and the AXISSTA-
TUS status will be cleared. Note that the status can not be cleared if
the cause of the problem is still present.
1
The axis moves at creep speed forward until the Z marker is encoun-
tered. The demand position is then reset to zero and the measured
position is corrected to maintain the following error.
2
The axis moves at creep speed reverse until the Z marker is encoun-
tered. The demand position is then reset to zero and the measured
position is corrected to maintain the following error.
3
The axis moves at the demand speed forward until the datum switch
is reached. The axis then moves reverse at creep speed until the
datum switch is reset. The demand position is then reset to zero and
the measured position corrected so as to maintain the following
error.
4
The axis moves at the demand speed reverse until the datum switch
is reached. The axis then moves forward at creep speed until the
datum switch is reset. The demand position is then reset to zero and
the measured position corrected so as to maintain the following
error.
5
The axis moves at demand speed forward until the datum switch is
reached. The axis then reverses at creep speed until the Z marker is
encountered. The demand position is then reset to zero and the
measured position corrected so as to maintain the following error.
6
The axis moves at demand speed reverse until the datum switch is
reached. The axis then moves forward at creep speed until the
Z marker is encountered. The demand position is then reset to zero
and the measured position corrected so as to maintain the following
error.