15. PMC CONTROL FUNCTION
B–63503EN–1/01
738
[Classification] Input signal
[Function] When this signal is set to “1”, commands from the PMC are not read while
the executing, waiting, or input buffer contains a block. If this signal is
set to “1” when any of these buffers contain a block, that block is executed
but subsequent commands are read only when the buffers are all empty.
To discriminate the buffering disabled condition, the CNC outputs the
axis control command read completion signal (EBSYg) only when a
command is read when all buffers are empty.
The timing chart for the command operation is shown below.
Command
disabled
EBSYg
(output)
[1]
EMBUFg
(input)
Beginning of
execution
[2]
[1] [2]
End
Command
block
(input)
EBUFg
(input)
Input buffer
Waiting buffer
Executing
buffer
Beginning of
execution
Buffering is disabled, regardless of buffering disable signal EMBUFg, for
the following commands:
(1) Skip–feed per minute (EC0g to EC6g: 03h)
(2) Reference position return (EC0g to EC6g: 05h)
(3) 1st reference position return (EC0g to EC6g: 07h)
(4) 2nd reference position return (EC0g to EC6g: 08h)
(5) 3rd reference position return (EC0g to EC6g: 09h)
(6) 4th reference position return (EC0g to EC6g: 0Ah)
(7) Machine coordinate system selection (EC0g to EC6g: 20h)
The following commands, for which reset signal ECLRg is used for
termination, operate as though buffering had been disabled. That is, the
subsequently specified block is not executed but canceled:
(1) Continuous feed (EC0g to EC6g: 06h)
(2) External pulse synchronization – main spindle
(EC0g to EC6g: 0Bh)
17 Buffering disable
signal EMBUFg