Siemens SINUMERIK 840Di Function Manual page 935

Errors, cause/description and remedy
Serial
no.
error
inform
ation
2
3
2.5 Linking PLC CPUs to 810D, 840D
2.5
General
The AS 300 family is used as the PLC for all systems. The essential difference between the
NCU variants lies in the method by which they are linked. On the 840D and 810D, the
PLC 314 CPU (user memory capacity up to 128 KB) or PLC 315-2 DP (user memory
capacity up to 288 KB) is integrated as a submodule into the NC unit.
The PLC/CPU 315-2 DP also supports distributed I/Os on the PROFIBUS (L2DP). The
relevant performance data for individual PLC CPUs can be found in the above table or in
Catalog FT70.
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Error Cause/description
PLC A system data block SDB 0 has
cannot been loaded with a modified
be MPI address. This has caused
accesse an MPI bus conflict due to dual
d in spite assignment of addresses.
of PLC
general
reset.
All four A system error has occurred in
LEDs on the PLC.
the PLC Actions: The diagnostic buffer
flash (DI on the PLC must be read to
disaster) analyze the system error in
detail. To access the buffer, the
PLC must be stopped (e.g., set
switch S4 to position 2). A
hardware reset must then be
performed. The diagnostic buffer
can then be read out with
STEP7. Relay the information
from the diagnostic buffer to the
Hotline / Development Service.
A general reset must be carried
out if requested after the
hardware reset. The diagnostic
buffer can then be read with the
PLC in the Stop state.
2.5 Linking PLC CPUs to 810D, 840D
Remedy
Disconnect all MPI cables to other
components. Create the link "Direct_PLC" with
the programmer. Correct the MPI address.
Once the PLC program has been reset or
reloaded, the system may return to normal
operation. Even in this case, the content of the
diagnostic buffer should be sent to the
Development Office.
Detailed description
2-23