Installation manual
CNC 8035
5.
CONCEPTS
Treatment of emergency signals
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·238·
PLC Treatment of emergency signals
The emergency inputs of the PLC are:
/EMERGENCY STOP
Physical input coming from the outside.
/ALARM (M5507)
Physical input coming from the CNC.
The emergency outputs of the PLC are:
/EMERGENCY OUTPUT
Physical output to the outside.
/EMERGEN (M5000)
Physical output to the CNC.
There are two ways to "tell" the PLC that an emergency condition must be treated, by activating the
physical input EMERGENCY STOP of the PLC (which is I1) or the general logic input "/ALARM"
of the PLC which is mark M5507.
In both cases, the treatment of these signals will be up to the PLC programmer. The PLC program
must have the necessary instructions to properly attend to these emergency inputs and act
accordingly.
By the same token, the PLC program must have the necessary instructions to properly activate the
emergency outputs when required.
These emergency signals are the physical output /EMERGENCY OUTPUT (output O1 of the PLC)
and the general logic output /EMERGEN" which is mark M5000 of the PLC.
It must be borne in mind that every time a new PLC program cycle is initiated, the real inputs are
updated with the physical inputs. Therefore, input I1 will have the value of the physical input /
EMERGENCY STOP.
Also, before executing the PLC program cycle, the values of the M and R resources corresponding
to the CNC logic outputs (internal variables) are updated as well as mark M5507 corresponding to
the /ALARM signal.
After the execution of each cycle, the PLC updates the physical outputs with the values of the real
outputs except the physical output /EMERGENCY OUTPUT which will be activated whenever the
real output O1 or mark M5507 (/ALARM signal coming from the CNC) is active.
To Next Page
Loading...
