Siemens Sinumerik 840D sl Diagnostic Manual page 44

Overview of Alarms
NCK alarms
Remedy: Please inform the authorized personnel/service department.
Take greater care when optimizing the clock times MD10050 $MN_SYSCLOCK_CYCLE_TIME,
MD10060 $MN_POSCTRL_SYSCLOCK_TIME_RATIO and/or MD10070
$MN_IPO_SYSCLOCK_TIME_RATIO.
The test should be performed with an NC program that represents the highest possible control load.
To be on the safe side, a margin of 15 to 25% should be added to the times determined in this way.
Program Con- Switch control OFF - ON.
tinuation:
4250 FastPlcCom functionality not available
Definitions: This alarm indicates that the PLC provides the None FastPlcCom functionality during start-up
although this functionality is requested by the NCK.
Reaction: Alarm display.
Remedy: Retrofit the PLC with the FastPlcCom functionality or deactivate the FastPlcCom functionality by
means of NCK machine data.
Program Con- Clear alarm with the RESET key. Restart part program
tinuation:
4252 PLCIO read error: %1
Parameters: %1 = PLCIO error code
Definitions: This alarm indicates that errors occured when reading the PLCIO with the FastPlcCom functionality.
- PLC hardware does not exist
- Incorrect data transmission
- Functionality is already used by 'technological function'.
Reaction: Alarm display.
Remedy: Check machine data MD10394 $MN_PLCIO_NUM_BYTES_IN / MD10395
$MN_PLCIO_LOGIC_ADDRESS_IN.
Check PLC hardware configuration.
Check whether 'technological function' already uses the functionality.
Program Con- Clear alarm with the RESET key. Restart part program
tinuation:
4254 PLCIO write error: %1
Parameters: %1 = PLCIO error code
Definitions: This alarm indicates that errors occured when writing on the PLCIO with the FastPlcCom functionality.
- PLC hardware does not exist
- Incorrect data transmission
- Functionality is already used by 'technological function'
Reaction: Alarm display.
Remedy: Check machine data MD10396 $MN_PLCIO_NUM_BYTES_OUT / MD10397
$MN_PLCIO_LOGIC_ADDRESS_OUT.
Check PLC hardware configuration.
Check whether 'technological function' already uses the functionality.
Program Con- Clear alarm with the RESET key. Restart part program
tinuation:
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SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG, 2009. All Rights Reserved
03/2009