Alarm Classes - Siemens SINAMICS S120 Commissioning Manual
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Diagnostics
5.4 Fault and alarm messages
5.4.5
Alarm classes
The function permits higher-level control (SIMATIC, SIMOTION, SINUMERIK, etc.) to have
different control reactions to alarm messages from the drive.
The new statuses act as alarms for the drive, therefore there is NO immediate reaction from
the drive (like for the former level "alarm").
Information on the alarm class is described in status word ZSW2 at bit positions bit 5/6 (for
SINAMICS) (see also "ZSW2" in Chapter "Cyclic communication" for PROFIdrive
communication in the SINAMICS S120 Function Manual Drive Functions).
ZSW2: Valid for SINAMICS Interface Mode p2038 = 0 (function diagram 2454)
Bit 5 - 6 Alarm classes alarms
= 0: Alarm (former alarm level)
= 1: Alarm class A alarms
= 2: Alarm class B alarms
= 3: Alarm class C alarms
These attributes for differentiating the alarms are assigned to the appropriate alarm
numbers. The reaction to the existing alarm classes in the alarm is defined by the user
program in the higher-level control.
Explanations of the alarm classes
● Alarm class A: Drive operation currently not limited
– E.g. alarm when measurement systems inactive
– No limitation on current movement
– Prevent possible switching to the defective measuring system
● Alarm class B: Time-limited operation
– E.g. prewarning temperature: Without further action the drive may need to be switched
– After a timer stage -> additional fault
– After exceeding a switch-off threshold -> additional fault
● Alarm class C: Functionally limited operation
– E.g. reduced voltage/current/torque/speed limits (i2t)
– E.g. continue with reduced accuracy / resolution
– E.g. continue without encoder
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Commissioning with Startdrive
Commissioning Manual, 12/2018, 6SL3097-5AA10-0BP0
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