Siemens SINUMERIK 840Di Function Manual page 976

Detailed description
2.7 Structure and functions of the basic program
As described in Section Control signals, all parameters must be programmed according to
data type.
Switching off flashing MCP:
With MCP firmware V5.01.01 and higher, flashing can be suppressed in offline mode. No
communication takes place in offline mode (e.g., if the MCP connection fails). During active
communication, a value can be specified in the output data using status bits 24 or 25 in
MCP1StatSend and MCP2StatSend.
The checkback signal transferred by the value is signaled back in the same bits in
MCP1StatRec, MCP2StatRec. Following a successful checkback signal, the status bits in
send status must be reset.
Implementation example is stored in the Toolbox.
Temperature monitoring of the MCP:
With MCP firmware V5.01.02 and higher, an increased temperature is signaled back via bit
28 = 1 in MCP1StatRec, MCP2StatRec.
Configuring
There are basically two communication mechanisms for transferring data between the
MCP/HHU and PLC. With the first mechanism, data are transported via the COM module
(840D/810D). The mechanism is parameterized completely via the MCP/HHU parameters in
FB1.
An overview of the various interfacing options as a function of the NC type used is given
below. In each case, the parameter set of FB1 and the valid status information relevant for
the respective data transmission method are specified.
If an error is detected due to a timeout monitor, a corresponding entry is made in the
diagnostic buffer of the PLC CPU (errors 400260 to 400262). In this case, the input signals
from the MCP or from the handheld unit (MCP1In/MCP2In or BHGIn) are initialized with 0. If
it is possible to resynchronize the PLC and MCP/HHU, communication is resumed
automatically and the error message reset by the BP.
840D: OPI/MPI connection
Communication starts from the PLC BP via the NCK and COM mode, i.e., even a link via the
MPI does not require an SDB210. Parameter settings are made via the relevant parameters
in FB1.
Fig. 2-15
2-64
840D: OPI/MPI connection
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0