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3 Settings, MPI/BTSS
3.1
MPI network rules for SINUMERIK 840D
HMI communica-
tion: BTSS bus
HMI communica-
tion: MPI bus
Associated condi-
tions for STEP 7
Logon IDs
Communication
links
3-22
An HMI component logs on onto the NCK and PLC servers as a client via the
COM module and is allocated communication resources by them as a result of
logging on.
Jobs with a bus address/job ID for NCK are routed by the COM module directly
to the NCK. Jobs with different bus addresses/job IDs are routed to the PLC.
This response is implicit routing, and no special routing information is required
in the COM module about other communication nodes on adjacent bus
systems.
An HMI component logs onto the NCK server as a client indirectly via the COM
module and directly at the server PLC is allocated communication resources by
them as a result of logging on.
Jobs with a bus address/job ID for NCK are routed by the COM module directly
to the NCK. Jobs with different bus addresses/job IDs are ignored by the COM
module. This response is also implicit routing, and no special routing information
is required in the COM module about other communication nodes on adjacent
bus systems.
It is not possible to configure the entire communication setup illustrated in
Fig. 3-3 in SIMATIC STEP7. Thus, STEP7 and any other engineering tools will
not provide all the possible communication links. In particular, the COM module
that acts as the link between the MPI and BTSS buses cannot be configured.
When a connection is established, a client component logs onto the PLC with its
logon ID. Typical logon IDs include programming device: "PG" and operator
panel: "OP". One communication link on the PLC is reserved for a component
with the logon ID "PG" and one for the "OP" logon ID. For historical reasons, an
HMI component with the logon ID: "PG" by default. For the "M to N" function, it
logs on with the logon ID: "OP".
The NCK, COM and PLC components allow the following maximum number of
possible communication links:
Component
NCK
COM
from BTSS bus to NCK
from BTSS bus to PLC
from MPI bus to NCK
1)
PLC
PLC 315-2DP (contained in: CCU3 and NCU*.3)
PLC 314C-2DP (contained in NCU*.4)
PLC 317-2DP (contained in NCU*.5)
from MPI bus to PLC
1) One communication link is reserved by default for connecting a programming device
(PG) e.g. for diagnostics with STEP7.
2) The number results from the maximum number of PLCs integrated into the NCU,
minus the active PLC communication links on the BTSS bus.
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
Number
5
3
3
3
4
12
32
2)
© Siemens AG 2006 All Rights Reserved
03/2006
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