·278·
Installation manual
CNC 8060
CNC 8065
5.
CNC-PLC COMMUNICATION.
(REF: 1402)
Auxiliary –H– functions.
5.2 Auxiliary –H– functions.
Up to 7 M and 7 H functions may be programmed in a block. The treatment of the auxiliary
H functions is similar to the M functions without synchronization.
The CNC indicates to the PLC which auxiliary H functions are programmed in the execution
block using 32-bit registers HFUN1 through HFUN7. Each one of them indicates the number
of one of the H functions programmed in the block. If all the registers are not used, the CNC
assigns $FFFFFFFF to the unused ones (those with the highest numbers).
This way, if a block contains functions H12, H20 and H35, the CNC will transfer the following
information to the PLC.
Command HFUN*. Checking if a function has been programmed in the block.
To know whether a particular H function is programmed in the execution block, use one of
the following methods:
• Check all the HFUN registers one by one until that particular H function is found or until
one of them has the value of $FFFFFFFF.
• Use the HFUN* format to check all the HFUN registers at the same time.
Sending and synchronizing the function.
The H functions are not synchronized and are sent out to the PLC at the beginning of block
execution.
The transfer of auxiliary H functions is described later on in this chapter. See
"5.4 Transferring auxiliary functions -M-, -H-, -S-." on page 282.
HFUN1 HFUN2 HFUN3 HFUN4 - HFUN7
12 20 35 $FFFFFFFF
Example to detect H77: If it has been programmed, it will return a "1", and a "0" if otherwise.
CPS HFUN* EQ 77 = ...
When executing a block like this:
X100 F1000 H11 H12
The functions are transferred as follows:
1 Functions H11 and H12 are sent out to the PLC
2 It does not wait for confirmation and the CNC moves the axis to X100.
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