Siemens SINUMERIK 840Di Function Manual page 1278

Detailed Description
2.12 Block descriptions
Help menu item
The information below can be viewed by selecting the corresponding submenu item:
• The Operator's Guide
• The Description of Variables
The copyright and the version number can also be displayed.
2.11.2.3 Start-up, installation
The Windows application "NC Var selector" is installed using the SETUP program supplied
with the package.
2.12 Block descriptions
2.12
2.12.1 FB 1: RUN_UP Basic program, start-up section
Description of functions
The synchronization of NCK and PLC is performed during start-up. The data blocks for the
NC/PLC user interface are created with reference to the NC configuration defined in the
machine data and the most important parameters verified for plausibility. In the event of an
error, FB 1 passes an error identifier to the diagnostics buffer and switches the PLC to the
STOP state.
To enable an orderly start-up of the control, it is vital to synchronize the NCK and PLC, as
these systems have their own types of power-up procedure. During start-up routine,
therefore, the CPUs perform "subsidiary start-up functions" and exchange ID information to
ensure that the procedure is functioning correctly.
Since the start-up procedure is asynchronous, it is unavoidable that one CPU may have to
"wait" until the other has "caught up". This is automatically managed by the basic program.
The integrated PLC only supports cold starts. A warm restart is not provided, i.e., following
system initialization, the operating system runs organization block OB 100 and always
commences cyclic execution at the start of
OB 1.
Users need only supply the FB 1 parameters that are relevant to their applications. The
preset values in the associated instance DB 7 do not need to be assigned. The block can
only be called in OB 100.
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PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0