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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 27105 - Axis difference in function safe cam minus , NCK: drive:
Alarm 27105 indicates a discrepancy between NCK and drive monitoring channels during Safe Cam Minus function verification in the cross-comparison result list 2. This dual-channel safety monitoring mismatch suggests either corrupted safety function data transmission, parametric misalignment between NCK and drive, or a hardware communication fault in the safety feedback path.
27105
Siemens 27105 - Axis difference in function safe cam minus , NCK: drive:
Axis difference in function safe cam minus, NCK: drive
During cross-comparison of result list 2 ("Safe cams" function) and result list 3/4/5/6/7 ("Safe cam track" function), the status of safe cam minus monitoring was found to be different in the NCK and drive monitoring channels. The following applies to the "Safe cams" function: - Safe cam 1-: bit 2, 3 in result list 2 - Safe cam 2-: bit 6, 7 in result list 2 - Safe cam 3-: bit 10, 11 in result list 2 - Safe cam 4-: bit 14, 15 in result list 2 The following applies to the "Safe cam track" function: (each of result lists 3-7 contains 6 cam results) - Safe cam 1-: bit 2, 3 in result list 3 - Safe cam 2-: bit 6, 7 in result list 3 - Safe cam 3-: bit 10,11 in result list 3 - Safe cam 4-: bit 14,15 in result list 3 - Safe cam 5-: bit 18,19 in result list 3 - Safe cam 6-: bit 22,23 in result list 3 - Safe cam 7-: bit 2, 3 in result list 4 - Safe cam 8-: bit 6, 7 in result list 4 - Safe cam 9-: bit 10,11 in result list 4 - Safe cam 10-: bit 14,15 in result list 4 - Safe cam 11-: bit 18,19 in result list 4 - Safe cam 12-: bit 22,23 in result list 4 - Safe cam 13-: bit 2, 3 in result list 5 - Safe cam 14-: bit 6, 7 in result list 5 - Safe cam 15-: bit 10,11 in result list 5 - Safe cam 16-: bit 14,15 in result list 5 - Safe cam 17-: bit 18,19 in result list 5 - Safe cam 18-: bit 22,23 in result list 5 - Safe cam 19-: bit 2, 3 in result list 6 - Safe cam 20-: bit 6, 7 in result list 6 - Safe cam 21-: bit 10,11 in result list 6 - Safe cam 22-: bit 14,15 in result list 6 - Safe cam 23-: bit 18,19 in result list 6 - Safe cam 24-: bit 22,23 in result list 6 - Safe cam 25-: bit 2, 3 in result list 7 - Safe cam 26-: bit 6, 7 in result list 7 - Safe cam 27-: bit 10,11 in result list 7 - Safe cam 28-: bit 14,15 in result list 7 - Safe cam 29-: bit 18,19 in result list 7 - Safe cam 30-: bit 22,23 in result list 7 Alarms NCK alarms Monitoring status (,): - OFF = Monitoring is inactive in this monitoring channel - OK = Monitoring is active in this monitoring channel, limit values are not violated - L+ = Monitoring is active in this monitoring channel, upper limit exceeded - L- = Monitoring is active in this monitoring channel, lower limit exceeded Control reaction: NC Start disable in this channel. Alarm display. A Stop F was triggered. If safe monitoring was active, STOP B was also triggered automatically. In this case, a power OFF/ON of the control will be required.
Root Cause Summary
Alarm 27105 indicates a discrepancy between NCK and drive monitoring channels during Safe Cam Minus function verification in the cross-comparison result list 2. This dual-channel safety monitoring mismatch suggests either corrupted safety function data transmission, parametric misalignment between NCK and drive, or a hardware communication fault in the safety feedback path.
Safety
- Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.
Causes and Fixes
- 1
Access Diagnostics > System Information > Safety Functions in SINUMERIK Operate panel and verify Safe Cam Minus status for axis %1. Note which Safe Cam level (1-4) shows discrepancy from alarm message.
- 2
In HMI Customize > Machine > Axis-specific Parameters, cross-reference MD35220/MD35240/MD35260/MD35280 values between NCK and active drive parameter set (check with manufacturer for drive-side access). Values must match exactly.
Parameter mismatch may require drive firmware download via Siemens STARTER or equivalent diagnostic tool.
- 3
Perform parameter reset: Power cycle control with all safety parameter MD35xxx retained, then re-initialize safety functions via Diagnostics > Safety > Reset Safe Functions. Monitor result list 2 bits during next cycle.
- 4
If alarm persists, download latest firmware for both NCK (SINUMERIK version) and drive (e.g., 6SL3 SINAMICS series) to ensure Safe Cam function code consistency.
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