The >PLC logic control procedure is in the
numerical control engine bed electricity design a very important link.
Selects Simens the 802D numerical control system, basically may
use the PLC subroutine storehouse, may rapidly complete a PLC
application procedure.
SINUMERIK the 802D numerical control system may widely apply to
the different type engine bed. It has the system integration
degree high, the module standardization, the structure is compact and
the performance price compared to the higher characteristic. The
modular PLC engine bed control subroutine storehouse using the siemens
which the system may directly already establish the use bureau
territory variable method establishment which becomes, greatly reduced
the engine bed electricity control debugging cycle, also gave the
engine bed manufacturer to bring the convenience.
The processing center PLC control procedure, stochastically
trades the knife (namely system to only to recognize cutting tool in
exchange cutting tool process but not to recognize knife set) the
control procedure is a quite complex controlled process in particular.
Must have simultaneously to consider the aspect quite are many,
but as for does not have the engine bed or the person including the
permission as a result of the misoperation injures the accident and
can have some essential prompt information, but also must consider
prevented ceases has the cutting tool exchange not correct chaotic
knife phenomenon, otherwise can occur because the cutting tool elects
to cause the possibility wrong which the processing work piece
discards.
Last year, the Shanghai third machine tool factory one machine
has provided a vertical processing center to Inner Mongolia.
This processing center has selected Simens the 802D numerical
control system, has selected the Taiwan Germany big manufacture belt
24 knives raised wheeled chain type knife storehouses.
The processing center basically has used being suitable which
the siemens provided to 802D the numerical control system modular PLC
subroutine storehouse. The modular PLC engine bed control
program library uses the bureau territory variable parameter the
method establishment to become. Its merit lies in the design
engine bed electricity control earlier period not to input the output
address the limit, may quite nimbly define the input output address.
The system basis engine bed function request, nimbly has
selected the PLC engine bed control subroutine which needs, smoothly
has realized to the entire machine PLC control. Smoothly
realizes the chain type knife storehouse stochastically to trade the
knife in particular the automatic control. The knife storehouse
stochastically trades the knife the automatic control trades the knife
procedure two parts including the PLC procedure and NC. Its
basic principle is:
Txx code activation knife storehouse control fixed cyclic
program MGZ. The MGZ basis programs the cutting tool number to
calculate a knife set of position which this cutting tool is at, and
nearby determined it revolves direction. The position and the
direction (belt mark symbol points) deliver PLC through assistance
function H1. To programs the position from the PLC procedure
control knife storehouse according to nearby the directional rotation
which the cutting tool is at to wait for trades the knife.
The M06 start trades knife fixed cyclic program TOOL. TOOL
controls various coordinates to join trades the knife position, and
starts the manipulator to trade the knife movement. After trades
the knife to complete, the activation renovates the cutting tool
parameter.
Stochastically trades the knife speaking of this engine bed
knife storehouse the automatic control, only has after carries out
entire NC to trade the knife procedure to be able to calculate entire
trades the knife process to finish, otherwise very much has the
possibility to make a mistake. For instance just exchanged the
good cutting tool in the manipulator instantaneous to press
repositions the key or arise suddenly the power failure to terminate
the procedure execution, then very much will have the possibility to
be able to have the next time cutting tool exchange not correct
chaotic knife phenomenon. The reason is on NC trades in the
knife procedure not to carry out the data to renovate the instruction,
makes the cutting tool data also to maintain the preceding data to be
the result of.
After the temporary severance processing procedure, starts
through the search function from the severance segment to carry out
again, that is does not have the question. But, when in the
future and will cross the latter T yard section talent through the
search function from the severance segment to start to carry out, then
had the possibility to be able to have the chaotic knife phenomenon.
Because on a T yard already carried out before the
execution-interruption, the PLC procedure control knife storehouse has
nearby chosen in advance according to the direction programs the
cutting tool to change to has traded the knife position which was at
to wait for traded the knife. This time, will search the
severance the segment in the future T yard to have the possibility for
to arrive by mistake, also will have the possibility wrong to trade
the cutting tool.
This machine moved a nearly for year in the user unit, numerical
control system or quite stable, the PLC procedure control quite strict
is reliable. Enable the user the utilization ratio to obtain the
full guarantee. |
