CNC Alarm Number Formats by Brand: FANUC vs SINUMERIK vs Mitsubishi vs HEIDENHAIN

🚨 This page is an identification card: how a number is shaped and where to look it up, never what a specific alarm means. It therefore does not duplicate the site’s “number to meaning” quick-reference tables. Ranges and prefixes follow public manufacturer documentation / official support material and previously verified in-site articles; always read the machine’s own manual and the full on-screen text for the meaning of a specific code. Before changing parameters, take a parameter and ladder export.

30-second identification: count digits, then read the prefix

Table 0　First action for six formats

1. Four-brand format overview

Table 1　Brand to format to lookup entry to in-site reference

The “in-site reference” column points to meaning-based tables; this page only gets you to the right table. That is the difference from the historical cross-brand alarm table: that one answers “what does this code mean”, this card answers “which control is this code from”.

2. FANUC: the letter prefix picks the subsystem

FANUC screen alarms usually carry a two-letter prefix that identifies the layer reporting; the numeric part is commonly four digits, with serial spindle alarms often as SP9xxx. Distinguish screen alarms from drive-display alarms: an amplifier’s own code appears on its 7-segment display in the cabinet, not in the NC alarm list.

Table 2　Common FANUC prefix shapes (shape only, no meanings)

Common numeric groups are 000~ programming/operation, 300~ pulse coder, 400~ servo, 500~ overtravel, 700~ overheat, 749~ spindle communication, 900~ system, 9000~ spindle; external alarms commonly use 1000~1999 for alarm messages and 2000~2999 for operator messages. 🚨 These groups are not fully identical across series — use them only for first-pass triage such as “a 4xx points to servo”; the exact meaning comes from the machine’s own manual.

3. SINUMERIK 828D: six-digit ranges pick the subsystem

828D alarm numbers are organised as six digits, and the first digit (or first two) largely identifies the subsystem. In the shop, leading zeros are often dropped, so 061000 becomes 61000 and 062000 becomes 62000 — when you see four or five plain digits, pad it back to six before reading the range. That is the most common trap.

Table 3　828D six-digit range shapes

Two practical tricks: for a 2xxxxx number, swap the leading 2 for F or A and go straight to the SINAMICS List Manual (shape example: 207016 → F07016); a 700000-series number has no meaning in the system manual because the builder wrote it. See 828D cycle alarms for the expanded discussion.

4. Mitsubishi M80 / M70: letter family plus four-digit detail

Mitsubishi screen alarms are a family letter (optionally with a unit number) plus a four-digit detail code, for example M01 0006 or S01 0032. A full reading has three parts: family letter → drive unit number (the 01/02/03… after S) → four-digit detail. The family letter alone is not enough; the last four digits do the real locating.

Table 4　Common Mitsubishi family shapes (shape only, no meanings)

The in-site M80/M70 five-family guide already expands each family, unit number and reset level; this page only gets you to “this is a Mitsubishi number” so you know whether to open the NC alarm manual or the drive unit manual.

5. HEIDENHAIN TNC: group number – hexadecimal index

On modern TNC controls (TNC7 / 640 / 620 / 320 / 128 and others) the official error list writes numbers as GROUP-CODE: a three-digit group, a hyphen, and a four-character hexadecimal index, e.g. 230-02BD. The group identifies the software subsystem that raised the error; the in-site six-digit code table uses the same convention.

Table 5　HEIDENHAIN group shapes and FN 14 ranges

🚨 Do not confuse an FN 14 error number with a TNC error code. FN 14 calls predefined messages from the NC program, and its ranges change by generation: the older iTNC 530 convention is 0–299 standard dialogs, 300–999 machine-dependent, 1000–1099 internal messages; on the TNC7/640/620 side this extends to 1000–2999 control-side predefined and 3000–9999 builder-defined. Older controls (TNC 124/310/4xx and iTNC 530) use the errors_en.chm help file, newer ones a consolidated official “NC Error Messages” list. On an iTNC 530, press HELP for the cause and correction of the active error, or ERR to list all current errors.

6. A six-digit number: 828D or HEIDENHAIN

This is the single most-asked forum question. Both look “six-digit”, but their structure is completely different:

Table 6　Splitting six-digit numbers

One-line rule: a hyphen, or any A–F, means HEIDENHAIN; plain digits that pad to six mean Siemens. A code such as F30001 starting with a letter is a SINAMICS drive fault code, not an NC alarm number shape.

7. In-site index and how to use it

Once the format is identified, move to a meaning-based table. Only this step needs a “number to meaning” reference.

Table 7　Enter the right in-site reference by brand

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Frequently Asked Questions

I see a six-digit alarm number. How do I tell 828D from HEIDENHAIN?

Look at the character set and structure, not the digit count. SINUMERIK 828D uses plain decimal six-digit numbers (often shortened to 61000 from 061000), where the range directly identifies NCK, cycles, SINAMICS drives or builder-defined messages. HEIDENHAIN TNC uses “three-digit group + hyphen + four-character hexadecimal index”, e.g. 230-001F, and the index can contain A–F. So a hyphen, or any A–F, means HEIDENHAIN; plain digits that pad to six mean Siemens. A code like F30001 beginning with a letter is a SINAMICS drive fault, not an NC alarm number. Once the brand is clear, press HELP on the relevant screen or open the official “NC Error Messages” / SINUMERIK diagnostics manual.

What do the SV / SP / PS prefixes in front of FANUC alarm numbers mean?

They are subsystem prefixes, used to triage before opening a manual: SV points to the servo axis side (amplifier, motor, feedback), SP to the spindle side (serial spindle alarms commonly appear as SP9xxx), and PS to program and setting items. The same digits with a different prefix send you to a completely different manual chapter. Other prefixes include OT overtravel, OH overheat, SR communication, SW parameter write status, IO storage, and DS/IE/PC. EX plus four digits is a machine builder external alarm, defined by the builder and absent from system manuals. Note that AL.xx on an amplifier display is a drive-level alarm, not part of the NC alarm table. This page gives shapes and entry points only — for the meaning of a specific code, use the machine’s own manual and the full on-screen text.

For Mitsubishi M80, which manual covers M01 and S01?

Identify the family first: M01 is the operation / PLC interlock family, while S01 (and S02–S04) is the servo / spindle drive family. Both are normally followed by a four-digit detail code, and those four digits are what actually locate the fault. For M01, start with the NC-side alarm/parameter manual and the builder’s PLC ladder to see which interlock condition is unmet. For S01, combine it with the AL.xx code on the MDS drive display and use the corresponding drive unit manual. An EMG display with a cause sub-code belongs to the E-stop chain; Z70/Z71/Z73 are the absolute position / battery family; Y codes are NC-to-drive communication. The in-site M80/M70 five-family guide expands each family and its reset level — this page only gets you to “this is a Mitsubishi number”.

Last updated: 2026-11-08