
B–62073E–1/04 2. INTERFACE BETWEEN CNC AND PMC–NA OR NB
– 335 –
2.3.87 Remote buffer
(a) Remote buffer input signals (RMTI0, RMTI1, RMTI2, RMTI3, RMTI4, RMTI5, RMTI6, RMTI7)
[Classification]
Input signals
(b) Remote buffer output signals (RMTO0, RMTO1, RMTO2, RMTO3, RMTO4, RMTO5, RMTO6, RMTO7)
[Classification]
Output signals
[Function]
PMC
CNC Remote buffer DI Host computer
DI (8 points)
DO (8 points)
DI
DO
The host and PMC can communicate with each other using a remote buffer.
The PMC communicates with the remote buffer at intervals of 16 ms. The host on the other hand, does not
communicate with the remote buffer regularly. Communication between the two is triggered by sending a com-
mand.
The host can communicate with the remote buffer only through protocol A. This protocol provides eight input
and output signals. The machine tool can use them for its own purposes.
2.3.88 Load display signals
Spindle override signals: SPA, SPB, SPC
[Classification]
Input signals
[Function] Informs the control unit of the spindle override value.
[Operation] When the load display function is executed, the override value specified by the signal is used
as the spindle speed override.
The table below lists the correspondence between the signals and override values.
Override
50 60 70 80 90 100 110 120
SPA 1 0 0 1 1 0 0 1
SPB 1 1 1 1 0 0 0 0
SPC 1 1 0 0 0 0 1 1
NOTE The control unit does not specify the voltage of the spindle motor by multiplying the specified
spindle speed and the override value selected by the signal. The signal informs the control unit
of the spindle speed override value selected by the switch on the machine operator’s panel.
The PMC multiplies the specified spindle speed by the override value.
0 : LOW
1 : HIGH