
2. SEQUENCE PROGRAM
B–61863E/15
PMC SEQUENCE PROGRAM
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(1) Input memory of CNC
The input signals from CNC are loaded in memory of CNC and are
transferred to the PMC at intervals of 8 ms.
Since the 1st level and the 3rd level sequence part directly refer to
these signals and process operations, these signals do not
synchronize with input signals from the CNC.
See item 2.5.3.
(2) Input signals from machine tool (DI/DO card)
Input signals from the machine tool are transferred to the input signal
memory from the input circuit (DI/DO card). 1st level and 3rd level
sequence part directly processes by reading signals loaded in the
input signal memory.
(3) Input signal memory
The input signal memory stores signals transferred from the machine
tool at intervals of 2 ms period.
The PMC 1st level sequence part and 3rd level sequence part are used
to read and process signals stored in this memory.
In this case, state of signals set in the input signal memory
synchronizes with that of 1st level sequence part but not with that of
3rd level sequence part.
See item 2.5.3.
(4) 2nd level synchronous input signal memory
The 2nd level synchronous input signal memory stores signals
processed by the 2nd level sequence section.
State of the signals set in this memory synchronizes with that of the
2nd level sequence part.
Input signal memory and input signals from the CNC are transferred
to the 2nd level synchronous input signal memory only at the
beginning of execution of the 2nd level sequence section. Therefore,
the status of the 2nd level synchronous input signal memory does not
change from the beginning to end of the execution of the 2nd level
sequence part.
Programmer function makes the processing so that the 1st level
sequence section and 3rd level sequence section use the input signal
memory and input signals from the CNC side and the 2nd level
sequence section uses the 2nd level synchronous input signal
memory.
(1) CNC output memory
The output signals are transferred from the PMC to the CNC output
memory at intervals of 8 ms.
(2) Output signals to machine tool (DI/DO card)
Output signals to the machine tool are transferred from the PMC
output signal memory to the machine tool.
(3) Output signal memory
The output signal memory is set by the PMC sequence program.
Signals stored in this memory are transferred to the machine side at
a 2 ms period.
2.5.1
Input Signal
Processing
2.5.2
Output Signal
Processing