What causes FANUC alarm 074?

Part program contains an illegal or malformed command related to the alarm condition. Missing required address word or parameter value in the program block. Programmed value is out of the allowable range. Conflict between active modal codes and the commanded function. Post-processor configuration mismatch for this Fanuc series.

How do I fix FANUC alarm 074?

1. Note the block number shown in the alarm screen and locate that block in the program. 2. Review the command in that block against the Fanuc programming manual. 3. Check for missing words, incorrect values, or conflicting G-code combinations. 4. Verify the program is post-processed for the correct Fanuc series. 5. Correct the program and dry-run at low speed before resuming machining.

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FANUC Controller

Program/G-code · Basic · 5-10 minutes

Alarm 074

Fanuc Alarm 074 - Invalid Program Number

Fanuc Alarm 074 occurs when the CNC attempts to call, execute, or register a program with an invalid program number format or value. This typically happens when the program number exceeds the allowable range defined by system parameters, contains non-numeric characters, or violates the naming conventions set by parameters 3107 and 3108.

FANUCProgram/G-codeBasic5-10 minutes

074

Fanuc Alarm 074 - Invalid Program Number

Illegal Program Number

Root Cause Summary

Fanuc Alarm 074 occurs when the CNC attempts to call, execute, or register a program with an invalid program number format or value. This typically happens when the program number exceeds the allowable range defined by system parameters, contains non-numeric characters, or violates the naming conventions set by parameters 3107 and 3108.

Safety

Program cannot be registered

Causes and Fixes

1
Press SYSTEM key, then soft key [PARAM]. Verify Parameter 3107 (minimum program number) and Parameter 3108 (maximum program number). Default is typically 1 and 9999 respectively.
2
Check the program number being called via M98 P____ or G65 P____ or being registered. Ensure it falls within the range defined by parameters 3107-3108.
3
If the program number is valid but parameters are restrictive, modify Parameter 3108 to expand the allowable range. Bit parameter 3107#0 may also affect 8-digit program number capability.
Parameter write enable (PWE) must be set to 1. Changing these parameters affects all program registration and calling functions.
4
Reset the alarm using RESET key and re-attempt program call or registration with corrected program number.

DIY Feasiblehigh confidence

Call a technician if:

·Memory corruption persists after power cycle
·Parameter corruption suspected
·Hardware-related program storage issues

Prevention

Establish program numbering standards
Validate programs before transfer
Regular backup of all programs
Train operators on proper program entry format

Common Mistakes

Using O0000 as program number
Forgetting O prefix in program headers
Using program numbers above 9999
Not checking M98 P values during program creation

Related Alarms

073 075 078 080

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