Code 4702: PROFIBUS I/O: The logical slot / I/O area address %1 was not found.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical PROFIBUS I/O: The logical slot / I/O area address %1 was not found. 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 = Area address Definitions: For PROFIBUS/PROFINET only: The logical slot / I/O area address was not found in MD10506 $MN_DPIO_LOGIC_ADDRESS_OUT with the stated slot / I/O area index in the current STEP 7 hardware configuration. Reaction: Interface signals are set. Alarm display. Remedy: Check the slot / I/O area address in the configuration (STEP 7, HW Config). 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 4702 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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