SINUMERIK 840D sl Alarm Code Quick Reference: Number Ranges, Reactions and Manual Index

🚨 Scope and compliance: number ranges and Reaction terms come from the public chapters of Siemens’ official “840D sl / SINAMICS S120 Alarms Diagnostics Manual” (SIOS entry IDs 109806981, 109748391, 109752346). The version-to-page comparison was checked in our 840D sl diagnostics manual guide. The manual text is copyright protected: this page explains how to locate an alarm by range, how to read the Reaction block and which manual to open. It reproduces no per-number alarm text and offers no manual download link, file mirror or archive. Alarm text, reactions and page numbers vary with the machine builder’s configuration and the software version, so always use the manual shipped with your machine and search by the full alarm number.

30-Second Triage: Find the Section by Alarm Number

Table 0　Six field needs and their first stop

Number Ranges: How the Six-Digit Code Is Divided

Write the number in full. A six-digit alarm must not be shortened to 4xxxx, and 400 000-499 999 is not a “machine data alarm” range: it is the general PLC alarm range. The range decides which manual to open and which team to call.

Table 1　Six-digit 840D sl alarm ranges (official manual scope)

Our 840D sl alarm list explained is the narrative companion to this map; for cycle alarms 61000 / 62000 see 828D cycle alarms.

System Responses: Official Reaction Terms

The same alarm number can produce a different Reaction on a different machine: the official manual lets machine data such as MD11412 $MN_ALARM_REACTION_CHAN_NOREADY reprogram some alarm reactions, and builders change defaults too. So a fault report should quote the Reaction block from the local alarm screen, not a table from the web.

Table 2　Official Reaction terms to tick off in a work order

Reactions fall into four classes: display only (log it, no stop), channel-level block (channel not ready / start disable), NC-level stop (NC not ready / NC Stop on alarm / mode group not ready) and PLC-level stop (PLC Stop). Misreading this layer is the fastest way to send a “check the PLC project” job to a drive-replacement crew.

How to Read an Official Sample Alarm Row

The three rows below demonstrate the reading method; they are not the full table. Each follows the manual’s fixed structure: Explanation, Reaction, Remedy, Program Continuation.

Table 3　Three official sample rows dissected (not a per-number full table)

Note that the official text for 2000 states it is also one of the reactions to a PLC stop: treat the first alarm that appeared as the root cause, not the secondary ones. For the basic PLC program blocks behind these signals see FB1 / FB2 / OB100.

Clearing the Alarm and Program Continuation

Every official alarm entry ends with a “Program Continuation” block. There are only four common forms, and a work order can quote them verbatim:

Table 4　Four official Program Continuation forms and the matching action

Safety boundary: take a recoverable backup before changing CNC machine data or the PLC project. After clearing a Safety Integrated alarm (027 000 range), the official confirmation / acceptance test must be repeated; simply pressing RESET until the display clears is not a release back to production.

Official Manual: Chapter Index and Search Keys

Do not look up alarms by page number. The same alarm sits on different pages in different software versions. Measured on this site in the diagnostics manual chapter guide: NCK alarms are on p21 in 4.8 SP1 but p29 in 4.95 SP1, and PLC alarms on p1337 in 4.8 SP1 but p1323 in 4.95 SP1.

Table 5　Four official search keys with measured version differences

Manual chapters follow the alarm families: NCK alarms, channel and axis alarms, Safety Integrated, Siemens cycles / user cycles, HMI, general PLC alarms, and SINAMICS drive faults and warnings. SINAMICS F / A codes belong to the drive manual, not the six-digit range table. Mixing them into this table is the usual reason nobody can find the text.

Which Team Owns This Alarm?

Table 6　Range-to-owner decision table: prepare this material before hand-over

Related Articles on This Site

Table 7　Further reading on this site

Frequently Asked Questions

Where can I find a complete SINUMERIK 840D sl alarm code list?

The complete per-number text exists only in Siemens’ official “SINUMERIK 840D sl / SINAMICS S120 Alarms Diagnostics Manual”. Find it on Siemens Support by entry ID (for example 109806981) and search the PDF by the full six-digit alarm number. Online excerpt tables are neither complete nor version-labelled, and they cannot contain text for the 500 000-899 999 builder range at all. This page provides the range map and the lookup method, not the manual text.

What does alarm 400000 mean on 840D sl?

400 000-499 999 is the general PLC alarm range, not a “machine data alarm” range, and a 4xxxx shorthand does not describe it. The meaning of a specific number such as 400000 depends on the text in the manual shipped with your machine or in the builder’s documentation: Siemens provides base text for part of this range, while builders configure their own alarms in the PLC project. Read the full six-digit number, the Reaction block and the interface signals on the alarm screen first, then trace the trigger condition in the PLC project.

Which manual section covers SINAMICS F-codes on 840D sl?

Use the SINAMICS S120 drive faults and warnings manual, not the six-digit range table. F means fault and A means warning, both reported by the drive itself under a numbering scheme separate from the six-digit NCK alarms. The 840D sl Alarms Diagnostics Manual also lists drive-related alarms, but looking for F... / A... in the NCK chapters under 0xxxxx or 2xxxxx will never find them.

Last updated: 2026-11-11

Official number range framework, reactions and manual chapter navigation