Code 207442: <location>LR: Multiturn does not match the modulo range
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>LR: Multiturn does not match the modulo range 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
Message value: Drive object: SERVO, VECTOR Reaction: OFF1 (OFF2, OFF3) Acknowledge: IMMEDIATELY Cause: The ratio between the multiturn resolution and the modular range (p2576) is not an integer number. This results in the adjustment being set back, as the position actual value cannot be reproduced after power-off/power-on. Remedy: Make the ration between the multiturn resolution and the modulo range an integer number. The ratio v is calculated as follows: 1. Motor encoder without position tracking: v = (p0421 * p2506 * p0433 * p2505) / (p0432 * p2504 * p2576) 2. Motor encoder with position tracking for the measuring gear: v = (p0412 * p2506 * p2505) / (p2504 * p2576) 3. Motor encoder with position tracking for the load gear: v = (p2721 * p2506 * p0433) / (p0432 * p2576) 4. Motor encoder with position tracki ng for the load and measuring gear: v = (p2721 * p2506) / p2576 5. Direct encoder without position tracking: v = (p0421 * p2506 * p0433) / (p0432 * p2576) 6. Direct encoder with positi on tracking for the measuring gear: v = (p0412 * p2506) / p2576 Note: With position tracking, it is recommended that p0412 and p2721 are changed See also: p0412, p0432, p0433, p2504, p2505, p2506, p2576, p2721
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 207442 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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