
B-63943EN-1/02-01
Edit
Apprv.
Design
Sheet
Title
Draw
No.
55/126
Date
Design
Descri
tion
Date
FANUC Se
ies 30i/31i/32i-
, 31i-
5
PMC Axis Control
2004.10.7
(17) Buffering disable signal EMBUFg <G142.2, G154.2, G166.2, G178.2>
[Classification] Input signal, group-by-group signal
[Function] Changes 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 1.1.1 (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 1.1.1 (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)