Code 15025: CHANDATA(%2): channel is not acti ve. Channel data will be ignored.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical CHANDATA(%2): channel is not acti ve. Channel data will be ignored. 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 = CHANDATA parameter Definitions: With a CHANDATA instruction, the data input for a channel is selected that has not been activated. Reaction: NC Start disable in this channel. Interface signals are set. Alarm display. Remedy: This is an informational alarm referring to the fact that the file loaded into the NCK contains data of an inactive channel. The number of the inactive channel is specified. S ubsequently, the data of this channel are not available in the NCK. The alarm may have two causes: (1) The channel is supposed to be activated by a following NCK RESET/POWER ON, i.e. the file must subsequently be reloaded.If the alarm oc curs again, the reason is: (2) th e specified channel is actually not supposed to be activated, however, the file contains the relevant data. For the 2nd reason, please check whether the syste m has correctly not activated the channel mentioned. If the channel has been activated, operation may be continued after another NCK RESET/POWER ON without further measures, i.e. reloading the file is not required. If the channel has not been activated, make sure that the channel in activated by mistake is re-activated. If the settings of the channel activation are part of the fi le to be loaded (e.g. archive file), the file must either be modified with the relevant program or the file has to be created once more in the same system with the correct channel number. Similar alarms: 15020, 15021. 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 15025 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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