Function Of Alarm - Siemens SINUMERIK 802D Training Manual

Section 3

3.1 Function of alarm

Alarms are generated for a purpose, the purpose is primarily to protect the
machine operator in the case of a dangerous situation and secondly to
protect the machine from damage.
To cater for the above two cases we can react in two ways:
1) Pure PLC reaction
2) PLC >> NC reaction
The first is to use the alarm to warn the operator of a problem, e.g. coolant
is low in the machine. In such a case the axis can be prevented from mov-
ing by various disable signals in the PLC interface.
The second case is to configure the alarm in such a way that the NC can
react itself. e.g. in the case of an alarm NC start can be automatically in-
hibited.
The possibilities are listed below:
MD 14516[index]
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
SINUMERIK 802D sl Operating and Service Training Manual
Function of alarm
Meaning
NC Start inhibit
Read-in disable
Feed disable for all axis
Emergency stop
PLC Stop
Cancel with Delete key
Power on
Page 3
Notes
C31
C31