Siemens SINUMERIK 840Di Function Manual page 1026

Detailed description
2.12 Block descriptions
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 procedure is described in
the Installation Guide (in the section describing the protection level concept) and in the
Programming Guide Advanced (protection levels for user data).
Note
After communication between the PLC and NC (read/write NC variables, FB2, 3, 5, or PI
general services, FB4) has been aborted by POWER OFF, the start jobs must be deleted in
the first OB1 run after cold restart or reset (signal: Req = 0).
FB 3 can only write NC variables if basic program parameter NCKomm has been set to "1"
(in OB100: FB 1, DB7). When channelspecific variables are written, only variables from one
and the same channel may be addressed via Addr1 to Addr8 in a job (FB 3 call).
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:
Group 1
Group 2
Group 3
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.
Declaration
FUNCTION_BLOCK FB 3
VAR_INPUT
2-114
Area
C[1]
C[2]
V[.]
Req :
NumVar :
Addr1 :
Unit1 :
Column1 :
N
N
H[.]
BOOL ;
INT ;
ANY ;
BYTE ;
WORD ;
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
B Q
B Q
Power Line Basic PLC Program (P3)
T
T