KFAS: Fanuc CNC Parts, Service, & Repair
Fanuc 0 CNC Status Display and Details of Diagnostics
The status of the CNC can be monitored at all times.
Press the DGNOS button to display the contents of the following diagnostics:
Fanuc Diagnostics 27, DGN 27
No. #7 #6
#5 #4
#3 #2
#1 #0
27
PCS ZRN4 ZRN3 ZRN2 ZRN1
PCS: 0: The spindle position coder one revolution signal is off.
1: The spindle position coder one revolution signal is on.
ZRN4-1 0: The pulse coder one revolution signal for 1 - 4 axis is off.
1: The pulse coder one revolution signal for 1 - 4 axis is off.
Fanuc Diagnostics 700, DGN 700
No #7 #6
#5 #4
#3 #2
#1 #0
700 CSCT
CITL COVZ CINP CDWL
CMTN
CFIN
When these bits are = 1, they mean the following:
CSCT: The CNC is waiting for the spindle constant speed reached signal.
CITL: The Interlock signal is on.
COVZ: The override is set to 0%.
CINP: In-position check is being made.
CDWL: A dwell command is being executed.
CMTN: A tool movement command is being executed in automatic operation.
CFIN: The M, S, or T function is being executed.
Fanuc Diagnostics 701, DGN 701
No. #7 #6
#5 #4
#3 #2
#1 #0
701
CRST
CTRD CTPU
When these bits are = 1, they mean the following:
CRST: An emergency stop, external reset, reset and rewind, or a reset button on the
MDI panel is on.
CTRD: Data is being input through the RS232 interface.
CTPU: Data is being output through the RS232 interface.
Fanuc Diagnostics 702, DGN 702
No. #7 #6
#5 #4
#3 #2
#1 #0
702 STP REST EMS
RRW RSTB
CSU
#7 #6 #5 #4
#3 #2 #1 #0
Cause
1 1 1
0 0
1 Emergency stop is applied
1 1 0
0 0
0 An external reset signal was applied
1 1 0
1 0
0 A reset and Rewind signal was applied
1 1 0
0 1
0 The reset button was pressed
1 0 0
0 0
1 A servo alarm occurred
1 0 0
0 0
0 A feed hold signal was applied, or the mode was switched
Fanuc Diagnostics 712, DGN 712
This diagnosis information is valid only if automatic operation is terminated when it should not be.
The information indicates the reason why the cycle start lamp (STL) is off.
No. #7 #6
#5 #4
#3 #2
#1 #0
712 STP REST EMS
RRW RSTB
CSU
#7 #6 #5 #4 #3 #2 #1 #0
1 1 1 0 0
0 0 1 The emergency stop signal (*ESP) was input.
1 1 0 0 0
0 0 0 The external reset (ERS) signal was input.
1 1 0 1 0
0 0 0 The reset & rewind (RRW) signal was input.
1 1 0 0 1
0 0 0 The MDI reset button was pressed.
1 0 0 0 0
0 0 1 A servo alarm occurred.
1 0 0 0 0
0 0 0 The feed hold (*SP) signal was input, or
manual mode was selected.
0 0 0 0 0
0 0 0 The machine stopped in a single block.
All these bits are cleared to 0 when the power is switched on.
The details of servo alarm 4x4 are provided by the following DGN,
in the order of X- through eighth axis. Example: 720=X axis, 721=Y axis, 722=Z axis, etc…
Fanuc Diagnostics 720, DGN 720
No. #7 #6
#5
#4 #3
#2 #1
#0
720 OVL LV OVC
HCAL HVAL DCAL FBAL OFAL
OVL: An overload alarm occurred.
The thermal overload has operated. Either an overheat has occurred, the thermal device has defected,
or the cable is broken. Please check DGN 730 for motor or amplifier overheat.
LV: A low voltage alarm has occurred. Either the input voltage is low or the MCC is defective.
OVC: An overcurrent alarm has occurred. Please check cutting conditions, motor
current waveform or digital servo parameter.
HCAL: An abnormal current alarm has occurred. Please check the transistor module of
the amplifier or the servo motor for short.
HVAL: An overvoltage alarm has occurred. Please check the input voltage,
regenerative circuit or servo motor.
DCAL: A regenerative discharge alarm has occurred. Please check the connection of
the discharge unit, condition of discharge transistor or amount of acc/dec.
FBAL: A disconnect of the pulse coder has occurred. A defective pulse coder or wire
break may cause the alarm. Also, please check the parameter for setting of feedback type or shield of the cable.
OFAL: An overflow alarm has occurred. Incorrect parameter of the digital servo is most
possible cause.
Fanuc Diagnostics 730, DGN 730
No. #7
#6 #5
#4 #3
#2 #1
#0
730 ALD
EXPC
ALDF EXPC
Details
OVL Alarm 1
0 Overheat detected at the Motor
0 0
Overheat detected at the amplifier
FBAL Alarm 1
0 Disconnect detected by hardware
0 0
Disconnect detected by software
1 1
Separate pulse coder detected by software.
The details of a serial pulse coder Alarm 319, 329, 339, 349 are indicated by the following diagnostics:
Fanuc Diagnostics 760, DGN 760
No. #7
#6 #5
#4 #3
#2 #1
#0
760 SFLG CSAL BLAL PHAL
SCAL
BZAL CKAL SPHAL
SFLG: This is not an alarm bit. It is set = 1 when serial pulsecoder is used.
CSAL: A check sum alarm occurred. The serial pulsecoder is defective.
BLAL: A low battery voltage alarm has occurred. Please replace the battery.
PHAL: An abnormal phase data alarm has occurred. Either the pulsecoder is defective
or the cable is faulty.
SCAL: An abnormal rotation speed count alarm has occurred. The pulsecoder is
defective.
BZAL: A battery zero alarm has occurred. The pulsecoder is powered for the first time.
Please check that the battery is properly connected and perform a zero return.
CKAL: A clock alarm occurred. Replace the pulsecoder.
SPHAL: An abnormal software phase detect alarm has occurred. Either the pulsecoder
or cable is faulty.
Fanuc Diagnostics 800, DGN 800
No. SVERR
800
The amount of position following error is displayed.
Fanuc Diagnostics 820, DGN 820
No. ABSMT
820
The machine position is displayed.
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