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Code WN70: I/O Link i STATUS

Issue Description & Safety Warning

The Fanuc 30i/31i/32i CNC has triggered a critical I/O Link i STATUS alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.

Official Troubleshooting Steps

ALARM (CHn Gxx Syy zz = **H) (Note1) Check the alarm information of applied I/O device. The status alarm except for the DO alarm occurs at “zz” bytes of slot “yy” of group “xx” in channel “n”. The “**H” shows some bits at which the alarm occurs by hexadecimal. For the details of the alarm of I/O devices, refer to the “Connection manual (HARDWARE) (B-64483EN)”. 1 When the unit name of the connected I/O dev ice is unknown, its hardware ID is displayed. 2 For some I/O devices, one unit such as a safety I/O unit may consist of two groups. If a connection failure occurs between groups containing units of the same type, PC058 instead of PC056 indicating a connection failure occurs as a unit failure. INPUT INVALID Input a valid address or numeric value. The input address or numeric value is invalid. PROGRAM IS PROTECTED BY PASSWORD Enter the password. The screen cannot be displayed because the program is pr otected by the password. ILLEGAL SUBPROGRAM NAME Input a existent subprogram number or symbol. A nonexistent subprogram number or symbol is specified. SYMBOL UNDEFINED Input a defined symbol or bit address. An undefined symbol character string is specified. THE NET IS NOT FOUND The s pecified net is not found. THE ADDRESS IS NOT FOUND The s pecified address is not found. THE FUNCTIONAL INSTRUCTION IS NOT FOUND The specified functional instruction is not found. WRITE COIL NEEDS BIT ADDRESS Specify a bit address for the write coil search. You entered a byte address when specifying an address used for the write coil search. SOME NETS ARE DISCARDED The system cannot pick up all the nets. Choose the nets to pick up, by using the LADDER DIAGRAM VIEWER display screen, and then perform the net pickup operation manually. The system failed to pick up all the nets because there were 128 nets or more to be picked up. PROGRAM IS BEING MODIFIED Disconnect the online communication with FANUC LADDER-III. Stop other applications from accessing the ladder data. The ladder data cannot be displayed because online communication with FANUC LADDER-III is in progress or another application is accessing the ladder data. THIS FUNCTION IS PROTECTED Cancel the protection by the programmer protection function or 8-level protection function. This function is protected by the programmer protection function or 8-level protection function. CANNOT EDIT FUNCTION BLOCK Edit the program using FANUC LADDER-III. An attempt was made to edit an FB main program. THIS NET IS PROTECTED When you are editing data on a per-subprogram basis, you cannot edit the subprogram frame nets (END1,

Source: Fanuc Series 30i/31i/32i-A Maintenance Manual, Appendix A Alarm List — PMC alarms (B-64485EN/01)

Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.

About Fanuc 30i/31i/32i CNC Alarms

Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code WN70 on the 30i/31i/32i CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Fanuc's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.

Complete Alarm List: 85 Fanuc 30i/31i/32i CNC codes.

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