FANUC PMC Alarm WN69

FANUC PMC Alarm WN69 I/O Link i DO ALARM Case Study

FANUC PMC Alarm

Cause of WN69 Alarm and Corrective Actions

PMC Alarm Message:

WN69 I/O Link i DO ALARM
(CHn Gxx Syy zz : PMCa Ybbb = **H)

Fault Location and Troubleshooting Method

Check the alarm information of the corresponding I/O device.

Related Explanation

A DO (output) alarm—such as ground fault or similar—has occurred in:
   •   Channel CHn
   •   Group xx
   •   Slot yy
   •   Byte zz

The PMC address of the DO where the alarm occurred is displayed as:

PMCa Ybbb

If the address belongs to DCSPMC, it is displayed as:

DCSPMC Ybbb

If an abnormality occurs in a DO that is not yet assigned, it will display:

PMC* Y***

**H is a hexadecimal representation of the alarm bits.
Bits that are “1” indicate where the DO alarm occurred.

Examples

Example 1:

PMC1 Y115 = 28H
(28H in binary = 0010 1000)
DO alarms occurred at:
   •   PMC1 Y115.3
   •   PMC1 Y115.5

Example 2:

PMC1 Y002 = 02H
(02H in binary = 0000 0010)
A DO alarm occurred at:
   •   PMC1 Y002.1

Example 3:

Machine: FANUC 31iB, Robodrill D14MiA
PMC alarm message:
WN69 I/O Link i DO ALARM
(CH1 G00 S01 02 : PMC1 Y022 = 01H)

Using the same bit conversion rule:

PMC1 Y022 = 01H
(01H in binary = 0000 0001)

A DO alarm occurred at:
• PMC1 Y022.0

By checking FANUC X/Y/F/G Signal Diagnostics,
the meaning of Y022.0 is:
• Single-block enable lamp
(Single-block indicator light)