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5.2 Power on and power-up
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Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
MMC100
If the MMC100 cannot establish a link to the NC, the message: “wait for NCU
connection:“x” seconds”, “x” = 1 to 60 appears on the screen. If a connection
has still not been established after this time, then rebooting takes place soon
after. Check the following:
S Is the SINUMERIK 840D (NCU module) ready to operate (digit “6” on status
display)?
S Is the MPI cable inserted, is cable attached properly to connector?
S If the reset button of the NCU was pressed again during power-up (e.g. as
performed during a software upgrade [position 1 / general PLC reset]), the
control system must be switched off and on again before the MMC can be
powered up successfully.
MMC102/103
If the MMC102/103 does not power up (screen remains dark), the 24V DC
power supply must be checked. If the power supply is present at the power unit
on the MMC102/103 and the seven-segment status display on the rear panel
does not light up, then the MMC102/103 module is defective.
If the MMC102/103 powers up, but cannot establish a link to the NC, then
“Communication to NC failed” is displayed in the message line at the bottom.In
this case, please check the following:
S Is the 840D (NCU module) ready for operation (digit “6” on status display)?
S Is the MPI cable inserted, is cable attached properly to connector?
S Is the baud rate in the Start-up/MMC/operator panel menu set correctly? It
must be set to 1.5 Mbaud (password for protection level 2 required).
Note
MMC 101/102
The display remains dark after a successful power-up.
The decimal point lights up during hard disk access operations.
MMC 103
An 8 is displayed after a successful power-up.
The decimal point lights up during hard disk access operations.
If the error message “Corrupt SWAP File!” appears under Windows 3.11, a new
swap file (20 MB) must be created under the standard Windows user interface.
Problems during
power-up
5 Power On and Power-Up
07.98
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