·480·
Installation manual
CNC 8055
CNC 8055i
11.
CNC-PLC COMMUNICATION
SOFT: V02.2X
Auxiliary M, S, T function transfer
11.2.1 Transferring M, S, T using the AUXEND signal
1. Once the block has been analyzed and after sending the corresponding values in the variables
"MBCD1-7", "SBCD", "TBCD" and "T2BCD", the CNC will tell the PLC by means of the general
logic outputs "MSTROBE", "SSTROBE", "TSTROBE" and "T2STROBE" that the required
auxiliary functions must be executed.
2. When the PLC detects that one of the STROBE signals is active, it must deactivate the general
logic input "AUXEND" to tell the CNC that the execution of the corresponding function or
functions is starting.
3. The PLC will execute all the auxiliary functions required, it being necessary to analyze the
"MSTROBE", "SSTROBE", "TSTROBE", "T2STROBE" general logic outputs and the "MBCD1-
7", "SBCD", "TBCD" and "T2BCD" variables in order to do this.
Once this has been executed the PLC must activate the general logic input "AUXEND" to indicate
to the CNC that the processing of the required functions was completed.
4. Once the general "AUXEND" input is activated, the CNC will require that this signal be kept active
for a time period greater than the value given to the general parameter "MINAENDW" (P30).
This way, erroneous interpretations of this signal by the CNC due to an improper PLC program
logic are avoided .
5. Once the period of time MINAENDW has elapsed with the general input "AUXEND" at a high
logic level, the CNC will deactivate the general logic outputs "MSTROBE", "SSTROBE",
"TSTROBE", "T2STROBE" to tell the PLC that the execution of the required auxiliary function
or functions has been completed.
When the block being executed has several auxiliary functions (M, S, T), the CNC waits a time period
set by general parameter MINAENDW (P30) between two consecutive transfers.
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