Code 380051: PROFIBUS/PROFINET: Multiple assignment of outputs on address %1
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical PROFIBUS/PROFINET: Multiple assignment of outputs on address %1 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
Parameters: %1 = Logical address Definitions: Multiple assignments of input data have been detect ed in the logical address space. Logical address: Base address of the address area defined several times Reaction: Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. Remedy: The address partitioning should be checked as follows: Check for multiple assignments in the following machine data: - MD13050 $MN_DRIVE_LOGIC_ADDRESS[0] - MD13050 $MN_DRIVE_LOGIC_ADDRESS [n-1]: n = highest axis index on control system - MD12974 $MN_PLC_DIG_OUT_LOGIC_ADDRESS, MD12975 $MN_PLC_DIG_OUT_NUM: PLC address area for digital outputs - MD12982 $MN_PLC_ANA_OUT_LOGIC_ADDR ESS, MD12983 $MN_PLC_ANA_OUT_NUM: PLC address area for analog outputs If no inconsistencies can be found in the parameters, compare these machine data with the configuration in the SDB (STEP 7 project). In particular, check that the lengths configured for the individual slots do not result in area overlaps. When you fi nd the cause of the error, change the machine data and/or SDB. Program Continuation: Switch control OFF - ON.
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 380051 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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