
B-63943EN-1/02 17.PMC CONTROL FUNCTION
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(17) Buffering disable signal EMBUFg <G142.2, G154.2, G166.2, G178.2>
[Classification] Input signal, group-by-group signal
[Function] Indicates the buffering disabled state.
[Operation] 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.
Table 17.1.1 (j) Timing chart of buffering related signals shows the
timing chart of command operation.
EMBUFg
(input)
Command block [1] [2]
(input)
EBUFg
(input)
Command
disabled
EBSYg
(output)
Input buffer
Waiting buffer
Executing buffer [1] [2]
Beginning of execution End Beginning of execution
Table 17.1.1 (j) Timing chart of buffering related signals
Buffering is disabled, regardless of the 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)