Alarm Classes - Siemens SINAMICS S120 Commissioning Manual

6.3.4

Alarm classes

Overview
The function permits a higher-level control (SIMATIC, SIMOTION, SINUMERIK, etc.) to have a
differentiated control response to alarm messages that are issued on the drive side.
The new statuses act as alarms for the drive, therefore there is no immediate reaction from the
drive (like for the former level "alarm").
The information regarding the alarm class for SINAMICS S120 drives is illustrated in status word
ZSW2 on the bit positions bit 5/6.
Further information
You can find further information on the ZSW2 in Chapter "Cyclic communication" in the
SINAMICS S120 Function Manual Communication.
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
Commissioning with Startdrive
Commissioning Manual, 06/2020, 6SL3097-5AA10-0BP2
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Diagnostics
6.3 Fault and alarm messages
341