Programming manual
486
CNC 8070
15.
STATEMENTS AND INSTRUCTIONS
Programming statements
(SOFT V02.0X)
468
15.1.24 Communication and synchronization between channels
Each channel may execute its own program simultaneously and
independently from other channels. But, besides this, it can also
communicate with other channels, transfer information or synchronize
in specific points.
The communication takes place on the basis of a number of marks
managed by the part-programs of each channel. These marks
establish whether the channel is waiting to be synchronized or it may
be synchronized, etc.
There are two different ways to synchronize, each offers a different
solution.
• Using the #MEET instruction.
The easiest way to synchronize. It stops the execution in all the
channels involved in the synchronization.
The set of marks being used are initialized after executing an M02
or an M30, after a reset or on power-up.
• Using the instructions #WAIT - #SIGNAL - #CLEAR.
This method is somewhat more complicated than the previous
one, but more versatile. It does not stop the execution in all the
channels in order to synchronize.
The set of marks being used are maintained after executing an
M02 or an M30, after a reset or on power-up.
The synchronism marks of the two methods are independent from
each other. The marks managed by the #MEET instruction neither
affect nor are affected by the rest of the instructions.
Other ways to synchronize channels
The common arithmetic parameters can also be used to communicate
and synchronize channels. By writing a certain value from a channel
and later reading it from another channel, it is possible to set the
condition to follow up on the execution of a program.
Accessing the variables of a channel from another channel can also
be used as a way to communicate.
Swapping axes between channels also makes it possible to
synchronize processes, because a channel cannot grab an axis until
it has been released by another one.
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