Siemens SINUMERIK 840D sl Function Manual page 603

27001 Axis %1 error in a monitoring channel, Code%2, values: NCK%3, drive %4
Parameter %1 = axis name, spindle number
%2 = supplementary information, crosswise data comparison index
%3 = supplementary information, comparison value, NCK
%4 = supplementary information, comparison value, drive
Explanation The status of the safety-related monitoring functions are cyclically and mutually compared between the two
monitoring channels (NCK and drive). The comparison is carried out separately for each NCK/drive combi‐
nation.
A criterion in a comparison list is compared between the NCK and drive in each monitoring clock cycle
(MD10091 $MN_INFO_SAFETY_CYCLE_TIME); the next criterion is compared in the next monitoring clock
cycle etc. Once the complete comparison list has been processed, the comparisons are processed again
from the beginning. The resulting total comparison time to process the list is displayed in MD10092 $MN_IN‐
FO_CROSSCHECK_CYCLE_TIME (factor x MD10091 $MN_INFO_SAFETY_CYCLE_TIME - the factor can
differ depending on the particular software version).
The "Defect in a monitoring channel" alarm is only output if the mutual comparison of the two monitoring
channels detects a difference between the input data or results of the monitoring. One of the monitoring
functions is no longer operating reliably.
The crosswise comparison index, output under %2, is also known as STOP F code. The STOP F code is also
output in Alarm 27001 where the NCK detected a crosswise comparison error for the first time. The STOP F
code of the drive (belonging to Alarm C01711) can be taken from the diagnostics screen or the drive parameter
r9795. If a difference is detected at several comparison steps, then also several STOP F code values can be
displayed, alternating, at these positions.
There are error profiles that are identified as a result of several comparison operations of the comparison list.
This means that the displayed STOP F code value doesn't always provide a clear statement regarding the
cause of the error. The associated procedure is then explained for each of the individual error codes.
0
No error has been detected in this monitoring channel. Alarm 27001 means that it involved one of the sub‐
sequent alarms (follow-on alarms) of alarm C01711 - and the valid STOP F code value is to be determined
using the diagnostics display or the drive parameter r9795.
1
For the monitoring functions SBH, SG, SBR or SE, a different state has occurred between the NCK and drive.
The actual status image (result list 1) is output from the NCK as supplementary input %3 (comparison value,
NCK) and the actual status image from the drive is output as supplementary info %4 (comparison value,
drive). The two supplementary infos are also saved in drive parameters r9710[0] (NCK) and r9710[1] (drive).
An example for evaluating the bit-coded result list is provided in the description of the drive machine data.
Remedy
The difference in the states between the drive and NCK should be determined and the function involved
should be investigated in more detail.
Example
State, NCK: SBH is active and ok
State, drive: SG1 is active and ok
The fault is caused due to the fact that the SGE "SBH deselection" is controlled differently. The signal source
should be checked on both the NCK and drive sides. Generally, the different control (in operation) is a result
of a hardware failure associated with the sensor signal involved. In the commissioning phase, the cause can
also be parameterizing or programming errors.
2
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
11.2 NCK safety alarms for SINUMERIK 840D sl
Diagnostics
603