Code 232135: <location>Encoder 2: Fault when determining the position
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Encoder 2: Fault when determining the position 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: Fault cause: %1 bin Drive object: SERVO, VECTOR Reaction: OFF1 (IASC/DCBRAKE, NONE, OFF2, OFF3) Acknowledge: PULSE INHIBIT Cause: The DRIVE-CLiQ encoder supplies status informati on via bits in an internal status/fault word. Some of these bits cause this fault to be triggered. Other bits are status displays. The status/fault word is displayed in the fault value. Fault value (r0949, interpret binary): Bit 0: F1 (safety status display) Bit 1: F2 (safety status display) Bit 2: Lighting (reserved) Bit 3: Signal amplitude (reserved) Bit 4: Position value (reserved) Bit 5: Overvoltage (reserved) Bit 6: Undervoltage (reserved) Bit 7: Overcurrent (reserved) Bit 8: Battery (reserved) Bit 16: Lighting (--> F3x135, x = 1, 2, 3) Bit 17: Signal amplitude (--> F3x135, x = 1, 2, 3) Bit 18: Singleturn position 1 (--> F3x135, x = 1, 2, 3) Bit 19: Overvoltage (--> F3x135, x = 1, 2, 3) Bit 20: Undervoltage (--> F3x135, x = 1, 2, 3) Bit 21: Overcurrent (--> F3x135, x = 1, 2, 3) Bit 22: Temperature exceeded (--> F3x405, x = 1, 2, 3) SINAMICS-Alarms Bit 23: Singleturn position 2 (safety status display) Bit 24: Singleturn system (--> F3x135, x = 1, 2, 3) Bit 25: Singleturm power down (--> F3x135, x = 1, 2, 3) Bit 26: Multiturn position 1 (--> F3x136, x = 1, 2, 3) Bit 27: Multiturn position 2 (--> F3x136, x = 1, 2, 3) Bit 28: Multiturn system (--> F3x136, x = 1, 2, 3) Bit 29: Multiturn power down (--> F3x136, x = 1, 2, 3) Bit 30: Multiturn overflow/underflow (--> F3x136, x = 1, 2, 3) Bit 31: Multiturn battery (reserved) Remedy: Replace DRIVE-CLiQ encoder.
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 232135 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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