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03/2006
Bus address and
GD circuit
Note
The parameter settings for the bus address (on the machine control panel) or
the GD circuit parameters (on the HHU) in the PLC basic program are used for
the logical addressing of the components. The physical addressing on the
BTSS/MPI is always done via the GD circuits, however. Each machine control
panel, interface for customer's operating panel, etc, must be addressed with a
separate GD circuit.
In the control, the bus address in the associated GD circuit is converted via the
PLC program.
On the machine control panel, the bus address, and thus the associated GD
circuits, are set via the DIP-FIX switches.
On the MPI, the same GD circuits are set, however, for the machine control pa-
nel, interface for customer's operating panel and PP031 components, even if
the bus addresses are different. This should be noted if more than one machine
control panel, etc, is used.
The following table illustrates the interaction.
Table 3-4
Example:
2 machine control panels (MSTTs) are to be connected to the MPI on a control.
The first MSTT can be connected to bus address 15 (GD circuit 1) and the se-
cond to bus address 12 (GD circuit 2).
MPI interface and
GD circuit
Note
If the "Communication Configuration" STEP7 tool is to be used to establish
PLC-PLC cross-communication on the MPI, for example, and if one or more
MSTTs are connected to the MPI, then the GD circuits assigned must be uni-
que. The "Communication Configuration" STEP 7 tool assigns the GD circuits,
starting with GD circuit 1 in ascending order. If the MSTTs are connected to the
BTSS, then this has no effect on the PLC–PLC communication on the MPI.
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
3.3
MPI default configuration for SINUMERIK 840D
Interaction between bus address and GD circuit
Bus addresses on the MPI
15, 14, 13
12, 11
10, 9
8, 7
6
5, 4
3 Settings, MPI/BTSS
GD circuit
1
2
3
4
8
5
3
3-27
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