FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
12. AUXILIARY FUNCTION
B–62764EN/01
152
In general, only one M code can be specified in a block. However, up to
three M codes can be specified at once in a block by setting bit 7 (M3B)
of parameter No. 3404 to 1. Up to three M codes specified in a block are
simultaneously output to the machine. This means that compared with
the conventional method of a single M command in a single block, a
shorter cycle time can be realized in machining.
CNC allows up to three M codes to be specified in one block.
However, some M codes cannot be specified at the same time due to
mechanical operation restrictions. For detailed information about the
mechanical operation restrictions on simultaneous specification of
multiple M codes in one block, refer to the manual of each machine
tool builder.
M00, M01, M02, M30, M98, M99, or M198 must not be specified
together with another M code.
Some M codes other than M00, M01, M02, M30, M98, M99, and
M198 cannot be specified together with other M codes; each of those
M codes must be specified in a single block.
Such M codes include these which direct the CNC to perform internal
operations in addition to sending the M codes themselves to the
machine. To be specified, such M codes are M codes for calling
program numbers 9001 to 9009 and M codes for disabling advance
reading (buffering) of subsequent blocks. Meanwhile, multiple of M
codes that direct the CNC only to send the M codes themselves
(without performing internal operations ) can be specified in a single
block.
One M command
in a single block
Multiple M commands
in a single block
M40 ;
M50 ;
M60 ;
G28G91X0Y0Z0 ;
:
:
:
M40M50M60 ;
G28G91X0Y0Z0 ;
:
:
:
:
:
12.2
MULTIPLE M
COMMANDS
IN A SINGLE BLOCK
Explanations
Examples

Leave a Reply

Your email address will not be published. Required fields are marked *