
B–62073E–1/042. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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2.3.85 Axis selection signals in actual speed display: ACTF1, ACTF2, ACTF3, ..., ACTF15
In the conventional system, the actual speed displayed on the CRT screen is a composite speed of all axes.
The axes to be included in the calculation of the actual speed can be selected by the signals entered from the
PMC.
For example, when two or more heads are simultaneously operated in the parallel axis control mode, the actual
speed of one of the heads can be displayed by selecting the axis corresponding to the head by entering signals
from the PMC.
Calculating the actual speed
The conventional system calculates and displays the actual speed periodically by considering the total dis-
tances the tool moves along all the axes. For example, when the machine has five axes, X, Y1, Z1, Y2, Z2,
the actual speed is calculated as follows. (Y1 and Y2, and Z1 and Z2 are different sets of parallel axes.)
F +
X
2
) Y1
2
) Z1
2
) Y2
2
) Z2
2
Ǹ
T
The signals entered from the PMC can select the axes to be included in the calculation of the actual speed.
If the signals are entered from the PMC so that the Y2 and Z2 axes are excluded from the calculation of the
actual speed, the speed is calculated as follows:
F +
X
2
) Y1
2
) Z1
2
Ǹ
T
Parameters 1020 to 1022 determine the correspondence between the axis names and the signals.
[Classification]
Input signal
[Function] Excludes the corresponding axis from the calculation of the actual speed. The signal is pro-
vided for each control signal. The number at the end of the signal name indicates the number
of the control axis.
ACTFi 1⋅⋅ The first axis is excluded from the calculation of the actual speed.
2⋅⋅ The second axis is excluded from the calculation of the actual
speed.
3⋅⋅ The third axis is excluded from the calculation of the actual speed.
⋅
⋅
15⋅The fifteenth axis is excluded from the calculation of the actual speed.
[Operation] When the signal is high, the corresponding axis is excluded from the calculation of the actual
speed. When the signal is low, the corresponding signal is included in the calculation of the
actual speed.
2.3.86 NC window signals
(1) Signal for selecting a tool post for NC window input/output: WHEAD (Series 15–TT)
[Classification]
Input signal
[Function] Selects tool post 1 or 2 when the window function command is executed.
[Operation] When the signal is low, the window function command inputs or outputs the data of tool post
1. When the signal is high, the window function command inputs or outputs the data of tool
post 2.
It takes at least 8 milliseconds for the NC unit to receive WHEAD after it is switched.
(2) Background editing state output signal: BGEDT (Series 15–M/T/TT)
[Classification]
Output signal
[Function] Informs the PMC that the CNC unit is in the background editing state.
[Output Condition]
The signal goes high when the CNC is in the background editing state. The signal goes low
when the CNC exits the background editing state.