Code 75018: [Channel %1: ] CLC: block %2 in programmable direction, error ID: %3
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] CLC: block %2 in programmable direction, error ID: %3 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 %3 = Error ID Definitions: The subfunction of the 3D clearance control programmed with CLC(3) "Closed-loop control in programmable direction" reports an error: Error ID: 0:CLC(3) was programmed without having set the corresponding option bit or without having entered an axis screen wi th three validly configured, simulated axes in MD $MC_CLC_PROG_ORI_AX_MASK. 1:The plane in which the closed-loop control direction is to be re-oriented, has not been defined. Probably, two directions programmed one after the other, are anti-parallel. Reaction: Interpreter stop NC Start disable in this channel. Interface signals are set. Alarm display. Remedy: Modify MD or the part program. Program Continuation: Clear alarm with the RESET key in all channels. Restart part program. Diagnostics Manual (DAsl), 03/2009
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 75018 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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