Siemens SINUMERIK 840D sl Function Manual page 749

Assigning priorities to Alarm 27090 only becomes effective if it occurs due to differences in the
$A_INSE system variables. Only then will this alarm be initiated as a result of different input
signals. For Alarms 27004, 27001 and 27101 to 27107, no additional condition is required, as
● Alarms 27001 and 27101 to 27107 cannot occur if a STOP B or a STOP A is already active.
When the SI functionality is active, STOP B and STOP A always occur as subsequent error
and do not provide the user with any additional information about the cause of the fault or
error.
● Alarm 27004 only occurs if differences are determined in the input signals.
Subsequent alarm for Alarm 27090
If Alarm 27090 is output, the following alarms are no longer displayed:
● 27001 defect in a monitoring channel
● 27004 difference, safety inputs
● 27020 STOP E initiated
● 27021 STOP D initiated
● 27022 STOP C initiated
● 27023 STOP B initiated
● 27024 STOP A initiated
● 27091 Error for crosswise data comparison NCK-PLC
● 27101 difference for the function, Safe Operating Stop
● 27102 difference for the function, safely reduced speed
● 27103 difference for the function, Safe End Position
● 27104 difference for the function, Safe Cam Plus
● 27105 difference for the function, Safe Cam Minus
● 27106 difference for the function safely reduced speed n
● 27107 difference for the function, cam modulo monitoring
Subsequent alarm for Alarm 27004
● 27001 defect in a monitoring channel
● 27023 STOP B initiated
● 27024 STOP A initiated
● 27101 difference for the function, Safe Operating Stop
● 27102 difference for the function, Safely-Limited Speed
● 27103 difference for the function, Safe End Position
● 27104 difference for the function, Safe Cam Plus
● 27105 difference for the function, Safe Cam Minus
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
11.5 Reducing the number of alarms
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Diagnostics
749