
B–62073E–1/042. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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Example In the case of a simultaneous start command for the first, third, and fourth axes
CDxX7 to CDxX0 = 00001010 (=0AH)
FDxX15 to FDxX0 = 0000000000001101 (=000DH)
PMC commands Buffers for pending Execution registers
commands (for each axis) (for each axis)
[AX1_BLK] [AX1] [AX1_act]
[AX2_BLK]
[AX3_BLK] [AX3] [AX3_act]
[AX4_BLK] [AX4] [AX4_act]
[AX5_BLK]
(1) Transfer to the buffers : The axis control block data signals are transferred immediately after the buffers
become empty.
(2) Transfer to the execution registers :The signals are transferred immediately after register [AXn_act]
becomes empty. Buffer [AXn], however, does not become empty.
When the signals have been transferred to registers [AX1_act], [AX3_act], and [AX4_act], buffers
[AX1], [AX3], and [AX4] become empty and the commands in the execution registers are started simul-
taneously. Other axes can be specified normally.
NOTE 1 The RSTx and STPx signals are effective independently for each axis even in the simultaneous
start mode.
NOTE 2 The starting of all the axes along which moving a tool is simultaneously started is stopped when
the SBKx signal goes high for one of them.
(3) Addition of feedrate related to the function of axis control by PMC:
(i) When the cutting feed command (feed per minute) for axis control by PMC is executed, the units
of the feedrate data can be made ten times larger than the specified units by setting the parameter
accordingly (data No. 1409 #1).
The specified cutting feedrate (feed per minute) can be overridden by axis control by PMC.
Example Assume the following:
Specified feedrate = 1000
Parameter No. 1409 #2 = 1
In this case, the PMC axis control feedrate will be 10000 mm/min.
(ii) In axis control by PMC, when rapid traverse, reference position return, and positioning in the ma-
chine coordinate system are performed, the feedrate set in parameter No. 1420 or that specified
as the feedrate data in the axis control command can be selected by setting the parameter accord-
ingly (data No. 1409 #2).
The feedrate data specified in the axis control command can be overridden by axis control by
PMC.
NOTE When rapid traverse, reference position return, and positioning in the machine coordinate
system are performed in axis control by PMC by using conversational macros, parameter No.
1409 #2 becomes ineffective. This means that only the feedrate set in parameter No. 1420 can
be used for execution.
(iii) By setting the parameter accordingly (data No. 1001 #6), external deceleration in axis control by
PMC can be applied to the axial movement being performed by one of the following axis control
commands:
– Rapid traverse
– Cutting feed mm/min
– Cutting feed sec/block
– Reference position return
– Positioning in the machine coordinate system