
B–62073E–1/042. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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If the acceleration/deceleration time for each axis (parameter 1645) is set to zero, this function is disabled.
Override signal can be applied during acceleration/deceleration. In this case, the overridden feedrate is
increased or decreased.
If the reset signal, axis control pause signal, or block stop signal is on, the speed is decreased gradually.
(5) Signals
(a) Velocity command skip signal: VCSKPx
[Classification]
Input signal
[Function] VCSKPx is set high to stop the rotation executed by setting the velocity command, CDxX7
to CDxX0, to 0DH, and to terminate the corresponding block.
[Operation] When the signal goes high, the velocity command is terminated. The system ignores the sig-
nal if it is set high before the block in which the velocity command is specified is executed.
The signal must be set low while the block is being executed.
(b) Override signal for each axis in PMC axis control: OVnX7 to OVnX0
[Classification]
Input signals
[Function] Override the feedrate of each axis specified by the PMC axis control function. The signal con-
sists of eight binary codes. It specifies an override obtained by the following expression:
Override =
7
i 0
(2
i
Vi ) %
where
Vi = 0 when the OVnXi signal is low
Vi = 1 when the OVnXi signal is high
Each bit has the following weight:
OVnX0 : 1% OVnX4 : 16%
OVnX1 : 2% OVnX5 : 32%
OVnX2 : 4% OVnX6 : 64%
OVnX3 : 8% OVnX7 : 128%
The override is assumed as 0% when all bits are set high or low.
The override can be specified in units of 1% in the range of 0% to 254%.
[Operation] The actual feedrate is determined by multiplying the feedrate specified by the PMC axis con-
trol function and the override selected by this signal.
(c) Override signals for PMC axis control in the simultaneous start mode: OVA7 to OVA0
[Classification]
Input signals
[Function] Override the feedrate specified by the PMC axis control function in the simultaneous start
mode. The signal consists of eight binary codes. It specifies an override obtained by the fol-
lowing expression:
Override =
7
i 0
(2
i
Vi ) %
where
Vi = 0 when the OVAi signal is low
Vi = 1 when the OVAi signal is high
Each bit has the following weight:
OVA0 : 1% OVA4 : 16%
OVA1 : 2% OVA5 : 32%
OVA2 : 4% OVA6 : 64%
OVA3 : 8% OVA7 : 128%
The override is assumed as 0% when all bits are set high or low.
The override can be specified in units of 1% in the range of 0% to 254%.
[Operation] The actual feedrate is determined by multiplying the feedrate specified by the PMC axis con-
trol function and the override selected by this signal.