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

FANUC PMC Alarm

WN69 Fault Causes and Solutions

PMC Alarm Message:

WN69 I/O Link i DO ALARM

(CHnGxxSyy zz: PMCaYbbb=**H)

Fault Location and Handling Method:

Confirm the alarm message of the corresponding I/O device.

Related Content:

A DO alarm (ground fault, etc.) has occurred in the zzth byte of the yy slot in group xx of CHn.

The PMC address of the assigned DO that triggered the alarm is displayed in “PMCa Ybbb”.

When the address is DCSPMC, it is displayed as “DCSPMC Ybbb”. Furthermore, when an anomaly occurs in an unassigned DO, it is displayed as “PMC* Y***”.

**H displays the bit that triggered the alarm in hexadecimal format. The bit that triggered the alarm is set to 1.

Examples:

Example 1: When "PMC1 Y115=28H" (28H converted to binary = 00101000), a DO alarm occurred in Y115.3 and Y115.5 of PMC1.

Example 2: When "PMC1 Y002=02H" (02H converted to binary = 00000010), a DO alarm occurred in Y002.1 of PMC1.

Example 3: FANUC 31iB D14MiA machine tool

PMC alarm content is as follows:

WN69 I/O Link i DO ALARM

(CH1G00S01 02: PMC1Y022=01H)

Based on the above number system conversion,

when "PMC1 Y022=01H" (01H converted to binary = 00000001), a DO alarm occurred at Y22.0 of PMC1.

By querying the FANUC X/Y/F/G signal diagnostic dataset,

it was found that Y22.0 indicates a single-segment active LED, i.e., a single-section indicator light.

The indicator lights on each section were checked and found to be normal.

The PMC parameters were checked; the interface is shown below:

After resetting the PMC parameters, disconnecting the power and restarting the device automatically cleared the PMC alarm.

If you encounter the above situation, you can try resetting the PMC parameters.