·512·
Installation manual
CNC 8055
CNC 8055i
12.
LOGIC CNC INPUTS AND OUTPUTS
SOFT: V02.2X
General logic outputs
12.7 General logic outputs
CNCREADY (M5500)
The CNC activates and maintains this signal high if the autotest which the CNC makes when it is
powered up has not detected any problem. Should any hardware error be detected (RAM, over-
temperature, etc.) this signal is set low.
START (M5501)
The CNC sets this signal high in order to tell the PLC that the START key on the front panel has
been pressed.
If the PLC program considers that there is nothing to prevent the part program from starting, it must
set the general logic input CYSTART at a high logic level, thereby starting the execution of the
program.
When the CNC detects an up flank (logic level change from low to high) at the CYSTART signal,
it reset the START signal to low.
FHOUT (M5502)
The CNC sets this signal high in order to tell the PLC that the execution of the program is stopped
due to one of the following causes:
• Because the CONTROL PANEL STOP key has been pressed.
• Because the general logic input /STOP has been set low, even though later it has returned high.
• Because the general logic input /FEEDHOL is low.
RESETOUT (M5503)
The CNC sets this signal high for 100 milliseconds, in order to tell the PLC that it is under initial
conditions because the Reset key on the front panel has been pressed or because the general logic
input RESETIN has been activated.
LOPEN (M5506)
The CNC sets this signal high in order to tell the PLC that the positioning loop of the axes is open
since an error has occurred.
Sample
CNCREADY AND (rest of conditions) = O1
The emergency output O1 of the PLC must be normally high. Should any problem come up on CNC
power-up (CNCREADY), emergency output O1 must be set low (0V).
Sample
START AND (rest of conditions) = CYSTART
When the cycle START key is pressed, the CNC activates the general logic output START. The PLC
must check that the rest of the conditions (hydraulic, safety devices, etc.) are met before setting the
general input CYSTART high in order to start executing the program
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