Installation manual
CNC 8055
CNC 8055i
MACHINE AND POWER CONNECTION
5.
SOFT: V02.2X
·137·
Connection of the emergency input and output
5.4 Connection of the emergency input and output
The emergency input of the CNC corresponds with the I01 input of the PLC and must be supplied
with 24V.
8055 CNC
pin 2 of connector X9 of the –Axes– module.
CNC 8055i
pin 10 of connector X2
Since the CNC also processes this signal directly, if the 24V disappear, the CNC will display
EXTERNAL EMERGENCY ERROR and will deactivate all axes enables and will cancel all velocity
commands.
During the initializing process carried out by the CNC on power-up, the EMERGENCY OUTPUT
of the CNC (pin 2 of connector X10) remains at low (at "0") in order to avoid a premature activation
of the electrical cabinet.
If this process is successful, the CNC will set the real value of PLC output O1 to "1". Otherwise, it
will keep the /EMERGENCY OUTPUT signal active (low) and it will display the corresponding error
message.
Once the initialization process is over, the PLC will execute the PLC program stored in memory. If
none is available, it wait for one to be entered and executed.
When the execution of the first cycle (CY1) (or the first program scan) is finished the PLC will assign
the value of output O1 to physical output "/EMERGENCY OUTPUT".
It is recommended to program the CY1 cycle of the PLC program assigning a value of 1 to O1 when
everything checks out fine and a value of 0 when there is an error.
The interface of the electrical cabinet will take into account all the elements that could cause this
type of error. Among such elements are:
• E-stop has been pressed.
• The travel limit of any axis has be exceeded.
• There is a malfunction on a drive or it is locked without velocity command signal.
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