Code 14096: [Channel %1: ] Block %2 illegal type conversion
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 illegal type conversion 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 = Channel number %2 = Block number, label Diagnostics Manual (DAsl), 03/2009 Definitions: During the program run, a variable value assignmen t or an arithmetic operation has caused data to be processed in such a way that they have to be converted to another type. This would lead to the value range being exceeded. Value ranges of the various variable types: - REAL: Property: Fractional number with dec. pt., value range: +/-(2-1022-2+1023) - INT: Property: Integers with signs, value range: +/-(231-1) - BOOL: Property: Truth value TRUE, FALSE, value range: 0,1 - CHAR: Property: 1 ASCII character, value range: 0-255 - STRING: Property: Character string (max. 100 values), value range: 0-255 - AXIS: Property: Axis addresses, value range: Axis names only - FRAME: Property: Geometric informat ion, value range: As for axis paths Overview of type conversions: - from REAL to: REAL: yes, INT: yes*, BOOL: yes1), CHAR: yes*, STRING: -, AXIS: -, FRAME: - from INT to: REAL: yes, INT: yes, BOOL: yes1), CHAR: if value 0...255, STRING: -, AXIS: -, FRAME: - from BOOL to: REAL: yes, INT: yes, BOOL: ye s, CHAR: yes, STRING: -, AXIS: -, FRAME: - from CHAR to: REAL: yes, INT: yes, BOOL: yes1), CHAR: yes, STRING: yes, AXIS: -, FRAME: - from STRING to: REAL: -, INT: -, BOOL: yes2), CHAR: only if 1 character, STRING: yes, AXIS: -, FRAME: - from AXIS to: REAL: -, INT: -, BOOL: -, CHAR: -, STRING: -, AXIS: yes, FRAME: - from FRAME to: REAL: -, INT: -, BOOL: -, CHAR: -, STRING: -, AXIS: -, FRAME: yes 1) Value <> 0 corresponds to TRUE, value ==0 corresponds to FALSE. 2) String length 0 => FALSE, otherwise TRUE. 3) If only 1 character. It is not possible to convert from type AX IS and FRAME nor into type AXIS and FRAME. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. Remedy: Modify the program section such that the value range is not exceeded, e.g. by a modified variable definition. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the program.
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 14096 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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