Siemens SINUMERIK 840D Diagnostics Manual page 527

10.04
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 Siemens AG, 2004. All rights reserved
SINUMERIK 840D/840Di/810D Diagnostics Guide (DA), 10.04 Edition
Communication failure
The operator panel is connected with the NC and PLC via a serial bus.
This alarm occurs when the communication to these components is interrupted.
In connection with this alarm, all display values connected with the NC/PLC become
invalid.
Such faults are normal while the controls are ramping up (e.g. after resetting).
- Alarm display.
The alarm disappears automatically as soon as the fault situation has ended.
If this alarm is continuously present, a wide variety of faults may be the cause. (e.g. wire
breakage, NC/PLC not ramped up,
faulty address/data transfer rate configuration of one of the bus nodes, etc.).
Internal
Waiting for a connection to the NC/PLC
The operator panel is connected with the NC and PLC via a serial bus.
This alarm occurs if the MMC is started for the first time and the NC/PLC ramp-up is not
yet finished or the communication to these components is faulty.
In connection with this alarm, all display values connected with the NC/PLC become
invalid.
Such faults are normal while the controls are ramping up (e.g. after resetting).
- Alarm display.
The alarm disappears automatically as soon as the fault situation has ended.
If this alarm is continuously present, a wide variety of faults may be the cause. (e.g. wire
breakage, NC/PLC not ramped up, faulty address/data transfer rate configuration of one
of the bus nodes, etc.).
Internal
Communication has failed.
The operator panel is connected to the NC and the PLC via a serial bus.
The alarm is displayed when the MMC is started for the first time and NC/PLC startup has
not yet been completed or when the communication with these components is disturbed.
With this alarm, all display values connected to the NC/PLC will become invalid.
Disturbances of that kind are normal during control start (e.g. after reset).
- Alarm display.
The alarm will disappear automatically as soon as the error situation has been cleared.
If this alarm continues to be displayed, there can be all different kinds of reasons for the
error (e.g. open circuit, no startup of NC/PLC, erroneous address/baudrate configuration
of one of the bus nodes, ...).
Internal
Faulty entry for hardkey 'Program' in Keys.ini.
The configuration in Keys.ini is wrong.
- Alarm display.
In Keys.ini, the parameter ChildTask:=26 has to be set in the line KEY2.0=.
The alarm can also be acknowledged manually via diagnostics.
Internal
1 Alarms
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