Siemens SINUMERIK 840D sl, Function Manual

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Detailed description
2.12 Block descriptions
Basic logic functions: PLC Basic program powerline (P3 pl)
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Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Machine data, GUD
In order to define machine data and GUDs without a password, the protection levels of the
data you want to access must be redefined to the lowest level.
The process is described in the /IADC/ Commissioning instructions, "Protection level
concept" or in the Programming Manual Job Planning, "Define protection levels for user data
(GUD)".
Notice
FB 3 can read NC variables only
if basic program parameter NCKomm ="1" has been set (in OB 100: FB 1, DB 7). The call is
permitted only in cyclic program OB 1.
When channel-specific variables are read, in a task (FB 3-call)
via Addr1 to Addr8 only the variables of exactly one channel may be addressed.
In areas V and H, different logic axis numbers must not be assigned in one job. (Failure to
observe this rule results in Error:= TRUE, State:= W#16#02).
NCK variables within one group can be combined in a job:
Area
Group 1 C[1] N B Q T
Group 2 C[2] N B Q T
Group 3 V[.] H[.]
The same rules apply to channels 3 to 10 as illustrated as examples in the above table in
groups 1 and 2.
Note
Especially when reading several long strings, the number of usable variables can be less
than 8.