Code 207457: <location>EPOS: Combination of input signals illegal
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>EPOS: Combination of input signals illegal 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: %1 Drive object: SERVO, VECTOR Reaction: NONE Acknowledge: NONE Cause: An illegal combination of input signals th at are simultaneously set was identified. Alarm value (r2124, interpret decimal): 0: Jog 1 and jog 2 (p2589, p2590). 1: Jog 1 or jog 2 and direct setpoint input/MDI (p2589, p2590, p2647). 2: Jog 1 or jog 2 and start referencing (p2589, p2590, p2595). 3: Jog 1 or jog 2 and activate traversing task (p2589, p2590, p2631). 4: Direct setpoint input/MDI and starting referencing (p2647, p2595). 5: Direct setpoint input/MDI and activate traversing task (p2647, p2631). 6: Start referencing and activate traversing task (p2595, p2631). Remedy: Check the appropriate input signals and correct.
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 207457 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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