Plc User Alarms; General Information; Alarm Properties - Siemens SINUMERIK 808D Commissioning Manual

Default PLC applications

6.3 PLC user alarms

6.3 PLC user alarms
6.3.1

General information

PLC user alarms can be used as one of the most effective diagnosis methods.
The SINUMERIK 808D control system provides 128 PLC user alarms (700xxx). Each alarm
corresponds with an alarm variable that is relevant to an alarm text, and each alarm
corresponds with a machine data MD14516 used to configure alarm properties.
6.3.2

Alarm properties

Alarm responses
You can configure the response of the control system after a user alarm is output:
● PLC STOP: When the user alarm is output, PLC detection stops, interface signal "NC
RDY" is disabled and all outputs are disabled.
● EMERGENCY STOP: The user alarm automatically activates interface signal "EMER
STOP".
● Feed disabled for all axes: The user alarm automatically activates interface signal "Feed
disable".
● Read-in disabled: The user alarm automatically activates interface signal "Read-in
disable".
● NC Start disabled: The user alarm automatically activates interface signal "NC Start
disable".
● Only display: No response occurs when the user alarm is output. Only alarm number and
alarm text are displayed.
Cancelling methods
You can configure a cancelling method for a PLC user alarm. There are totally three
cancelling methods available:
● POWER ON: cancel the user alarm by re-powering on the control system after clearing
the conditions for the alarm.
● <ALARM CANCEL> key on the PPU or <RESET> key on the MCP: cancel the user alarm
by pressing the <ALARM CANCEL> key or the <RESET> key after clearing the
conditions for the alarm.
● Auto-cancelling: the user alarm disappears automatically after clearing the conditions for
the alarm.
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Commissioning Manual, 01/2015, 6FC5397-4EP10-0BA0
Commissioning Manual