Assigning Priorities To Alarms - Siemens SINUMERIK 840D sl Function Manual

Diagnostics
11.5 Reducing the number of alarms
global acceptance test group alarm 27135 "Axis %1 checksum group error, safety-related
monitoring functions on at least one axis. Confirmation and acceptance test required", replaced.
Note
The alarm reduction is only made in the SPL commissioning mode (MD
$MN_PREVENT_SYNACT_LOCK[0,1] = 0). Outside this mode, when changing the parameter
assignment, the corresponding individual axis-specific alarms 27032, 27035 and 27060 are
always output.
Acceptance test alarms of the drive are not included in the alarm reduction. The reason for
this is that a parameterization change, which results in acceptance test alarms, can be
performed independently of one another in the two monitoring channels.
It does not make sense to reduce the global acceptance test alarms (27070-27073). The
reason for this is that these alarms, which refer to a checksum error in the SPL
parameterization, PROFIsafe configuration or I/O coupling (peripherals), is only output if the
axis-specific monitoring functions have been enabled.
Boundary condition
The MD is not incorporated in the axis-specific safety MD checksum. This means that the
function can be enabled/disabled at any time by changing the MD. In the acceptance test, the
alarm suppression should be internally deactivated so that the two-channel fault/error detection
can be checked. It can then be subsequently activated in order to reduce the number of alarms
that end users have to cope with.
11.5.2

Assigning priorities to alarms

Especially for machines with an extremely high number of axes, the previously described alarm
suppression function is not adequate in order to obtain a display of the real fault/error codes.
Just one single defective input signal can cause alarm 27001 (or 27101 to 27107) to occur for
many axes if this input signal has been configured as SGE on several axes. The cause of the
fault/error can be hidden as a result of the large alarm list.
This is the reason that priorities are assigned to Alarms 27090, 27004, 27001 and 27101 to
27107. For these alarms
● A subsequent (follow-on) alarm that occurs afterwards is no longer displayed. This alarm
is also not visible in the alarm log.
● A subsequent (follow-on) alarm that already occurred beforehand is cleared again. This
alarm is then visible in the alarm log.
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Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated