Detailed description
2.1 Key PLC CPU data for 810D, 840D and 840Di
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
13
840Di 840D
DP master system no.
MPI/DP
2 N/A
programmable block
communication PBK
Yes Yes
Consistent Data to standard
slave via SFC 14, 15
128 128
1) Notice!: The inputs/outputs above 4096 are reserved for integrated drives.
2) Subrack 0 is integrated in the NC. Subracks 1 to 3 are available for I/O devices.
I/O expansion
840Di 840D
PLC CPU
MLFB
Integrated PLC 317-2DP
master/slave
6FC5 317-2AJ10-0AB0
Integrated PLC 317-2DP
master/slave
6FC5 317-2AJ10-1AB0
I/O modules PROFIBUS only 24
PROFIBUS DP modules 1 (2) 1
Interfaces (MPI) 1 (0) 1
Note
Number of PROFIBUS slaves
Because SDB 2000 and other SDBs must be stored by the PLC operating system in the
static RAM area, which the Profibus ASIC can also access, the information from SDB2000
can continue to be transferred to the NCK and the PLC basic program in conditioned form
(CPI interface).
This is necessary for controlling the drives and PROFIsafe modules on Profibus. A memory
area defined by the PLC is available for these data structures. Its size is limited by the
maximum number of slots. This means that during loading, SDBs with fewer slaves than
listed above may be rejected. A slot is usually a slave module or the slave itself. Only in a
module with both I and Q areas does one module count as 2 slots.
It is, therefore, not possible to specify the size of SDB 2000 exactly.
It is only possible to say whether the configuration is permssible after the SDB container has
been loaded into the CPU. The values specified in the tables mentioned above are therefore
only intended as guidelines.
If the configuration is impermissible, a request for a general reset is issued when the SDBs
are loaded. The cause of the configuring error can be found in the diagnostic buffer on
completion of the general reset.
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