
15. PMC CONTROL FUNCTION
B–63503EN–1/01
764
The external workpiece coordinate system shift adjusts the workpiece
coordinate system depending on the shift amount set via PMC. Each axis
(parameter No. 1220) has this shift amount, and it is added to all the
workpiece coordinate systems for use. The shift amount is not lost by cut
off of the power supply. It is not added incrementally, but each input shift
amount makes a new shift amount. The amount that can be input is
0-"7.999 mm or "0.7999 inch.
The machine coordinate system can be shifted by inputting shift value.
When the shift amount is input, compensation is immediately applied to
the corresponding axis and the machine starts operation. The position
accuracy can be improved by combining this function with the sensor.
The specification method for the axis to be shifted is the same as that for
the external workpiece coordinate system shift.
The compensation value is specified for the signals ED0 to ED15 by a
binary code ranging from 0 to "9.999. This compensation value should
be absolute and the amount which the machine actually moves on input
is the difference from the previously stored value. When a large amount
of compensation is applied at a time, an alarm such as “excessive error on
stop” may occur. In this case, input the compensation amount several
times.
(a) External alarm message
The external alarm message holds the CNC under an alarm
condition by sending an alarm number from the external unit, as
well as a message that is displayed on the CRT screen of the CNC.
Up to four alarm numbers and messages can be sent at a time; the
alarm number ranges from 0 to 999, and the CNC displays it with
1000 added. The message for one alarm number can be up to 32
characters long. The alarm condition is reset by external data.
(b)External operator message
The external operator message sends the operator message and
number from the external unit to the CNC, with a display on the
CRT screen of the CNC.
Only one message can be transmitted, with a potential message
length of 255 characters. The alarm number ranges from 0 to 999;
from 0 to 99, the CNC adds 2000 to the number, while from 100
to 999 the number is not displayed, only the message is displayed.
Data specification method in external message
Item
E
A
6
E
A
5
E
A
4
E
A
3
E
A
2
E
A
1
E
A
0
ED15 to ED0
(binary)
Alarm set 1 0 0 0 0 0 0 Alarm No.
Alarm clear 1 0 0 0 0 0 1 Alarm No.
Operator mes-
sage list
1 0 0 0 1 0 0 Message No.
Operator mes-
sage clear
1 0 0 0 1 0 1 Message No.
Message 1 0 0 0 × 1 1 Character
(Note)
3) External workpiece
coordinate system
shift
4) External machine
coordinate system
shift
5) External alarm
message