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11 Data Back-Up
11.14 Back up PLC data
11.14
Back up PLC data
Original image of
project
Instantaneous
image of PLC-CPU
11-264
The consistency of the PLC data back-up is guaranteed only if you take the
following steps in the given order:
1. Switch PLC to PLC STOP (set PLC switch S4 to position 2)
2. Transfer PLC data from PG to control
3. Archive PLC data
4. Switch PLC to PLC-RUN (set PLC switch S4 to position 0)
If you following this sequence of steps, an original image of the project will be
generated in the data management system.
If you cannot perform the operations described above, you can – as an alterna-
tive – switch the PLC from PLC-RUN to PLC-STOP:
1. Switch PLC to PLC STOP (set PLC switch S4 to position 2)
2. Archive PLC data
3. Switch PLC to PLC-RUN (set PLC switch S4 to position 0)
If you following this sequence of steps, an instantaneous image of the PLC-
CPU content will be generated in the data management system.
Note
If you back up the PLC data while the PLC is operating in cyclic mode (PLC-
RUN), the data blocks are not backed up at the same time. This may result in a
data inconsistency that causes the PLC to stop in the user program.
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
© Siemens AG 2006 All Rights Reserved
03/2006
J
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