
B–62073E–1/04 2. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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(e) Second feedrate override B
This function selects the second feedrate override in the range from 0 to 655.34 with 0.01% increments.
[Classification]
Input signals
[Function] Overrides the cutting feedrate. The feedrate overridden with the first override (FV0 to FV7)
is further overridden. Whether to use these signals can be selected by a parameter. These
signals form a 16–bit bi nary code and correspond to the override value as follows:
Override value =
7
i0
(2
i
Vi)
×0.01%
where Vi = 0 when APFi is high and
Vi = 1 when APFi is low
That is, each signal has the following weight:
APF00 : 0.01% APF04 : 0.16% APF08 : 2.56% APF12 : 40.96%
APF01 : 0.02% APF05 : 0.32% APF09 : 5.12% APF13 : 81.92%
APF02 : 0.04% APF06 : 0.64% APF10 :10.24%APF14 :163.984%
APF03 : 0.08% APF07 : 1.28% APF11 :20.48%APF15 :327.68%
When all these signals are low, an override of 0% is assumed, just like when all these signals
are high.
The override can be selected in the range from 0 to 655.34% with 0.01% increments.
[Operation] Same as the specifications for the conventional second feedrate override.
Example To set the second feedrate override to 55.55%, set the signals as follows:
11101010G146
01001100G147
(f) Override cancel signal (OVC [#1, #2])
[Classification]
Input signal
[Function] This signal forces the feedrate override to 100%.
[Operation] When this signal goes high, the feedrate override set with
FV0 to FV7 and the second fee-
drate override
AFV0 to AFV7 are ignored, and they are assumed to be 100%. This means
that operation is performed at the specified feedrate.
This signal is ineffective for both rapid traverse override and manual feedrate override, and
does not affect them.
2.3.20 F1 digit selection
(a) F1 digit selection signal (F1D)
[Classification]
Input signal
[Function] This signal specifies that the manual pulse generator is to be used to increase or decrease
an F1 digit feedrate set in the control unit.
When a numeric value following address F for feedrate consists of only one digit, the numeric
value is assumed to specify one of nine feedrates (F1 to F9) set in the control unit (option).
The feedrates set in the control unit can be changed using the MDI. In addition, a feedrate
set in the control unit can also be increased or decreased by turning the manual pulse genera-
tor while the feedrate is being used; however, the manual pulse generator is also used in its
original mode for axis feed by a manual handle interrupt. So this signal selects which mode
to set.
[Operation] When this signal goes high, the control unit functions as described below.
1 When movement in automatic operation mode is in progress according to an F1 digit
command, the selected feedrate can be increased or decreased by the rate indicated
below by turning the manual pulse generator.