Code 7100: Compile cycles VDI area: %1 byte for inputs and %2 byte for outputs. Maximum %3 bytes available.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Compile cycles VDI area: %1 byte for inputs and %2 byte for outputs. Maximum %3 bytes available. 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 = String (machine data) %2 = String (machine data) %3 = Max. length for interface Definitions: The sum of the input and output bytes at the VDI us er interface for the comp ile cycles exceeds the maximum quantity of 400 bytes. Reaction: NC not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: Please inform the authorized pers onnel/service department. Set the machine data for dividing up the VDI user interface of the compile cycles (DB 9) into input and output bytes in accordance with the functions in the compile cycles. The maximum quantity of 400 bytes must not be exceeded. There are no restrictions concerning the division into input and output bytes. 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 7100 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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