Siemens SINUMERIK 840D sl Series Diagnostics Manual page 431
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08/2005
- NC Stop on alarm.
Remedy:
Check the IPO cycle on all the NCUs.
If necessary, check NCU link-specific alarms first.
Program Con-
Switch control OFF - ON.
tinuation:
28001
NCU link connection to the NCU %1 of the link network has been aborted
Parameters:
%1 = NCU number
Definitions:
All NCUs in the NCU link network exchange data cyclically (sign-of-life). If this alarm
occurs, sign-of-life signals have not been received from one other NCU on the NCU net-
work. (see alarm parameters) This fault in the link can have various causes:
• Defective hardware.
• The machine data which configure the NCU link are not identical on all NCUs.
• An identical interpolator cycle time has not been selected on all NCUs.
Reactions:
- NC not ready.
- Channel not ready.
- NC Start disable in this channel.
- Interface signals are set.
- Alarm display.
- NC Stop on alarm.
Remedy:
• Check the IPO cycle on all the NCUs.
• If necessary, check NCU link-specific alarms first.
Program Con-
Switch control OFF - ON.
tinuation:
28002
Error on activation of machine data, NCU network-wide machine data were modi-
fied by NCU %1
Parameters:
%1 = NCU number
Definitions:
During the activation of machine data with NEWCONFIG or during an operator panel
RESET, NCU network-wide machine data were modified on another NCU. This alarm can
only occur when a link connection is active.
Reactions:
- NC not ready.
- NC Start disable in this channel.
- Interface signals are set.
- Alarm display.
- NC Stop on alarm.
Remedy:
Repeat the operator action or, if NEWCONFIG is activated by an NC program, terminate
the program with Reset.
Program Con-
Clear alarm with the RESET key. Restart part program
tinuation:
28004
NCU link: NCU %1 of the link network is not on the bus
Parameters:
%1 = NCU number
Definitions:
Error message of the NCU link module. When the NCU link was powered up, the local
NCU (indicated by the alarm) detected that the NCU with the number in the alarm param-
eter was not on the bus although it should be connected according to the MD settings.
This fault in the link can have various causes:
• Defective hardware.
• The machine data which configure the NCU link are not identical on all NCUs.
• An identical interpolator cycle time has not been selected on all NCUs.
Reactions:
- NC not ready.
© Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
Overview of Alarms
2-431
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