Siemens SINUMERIK 840D sl Function Manual page 875

Relevant parameters (FB1)
MCP
MCP failure normally switches the PLC to the STOP state. If this is undesirable, then OB82,
OB86 can be used to avoid a PLC stop. The basic program has, as standard, the OB82 and
OB86 call. FC5 is called in these OBs. This FC5 checks whether the failed slave is an MCP.
If this is the case, no PLC stop is triggered. Setting MCPxStop:= TRUE causes the basic
program to deactivate the MCP as a slave via SFC12. If the PLC does not switch to the stop
state following the failure or fault of the MCP, an alarm message will be generated via the basic
program. The alarm is deleted when the station returns.
PROFINET connection (MCPBusType = 6)
In case of PROFINET connection of the MCP, this component must be parameterized in the
hardware configuration setting of STEP 7. The MCP is coupled with the PROFINET module
of the CPU.
When parameterizing the MCP in HW Config, the addresses should be placed in the input and
output mapping area. These start addresses must also be stored in the pointer parameters
(MCPxIn and MCPxOut) of FB1. This is because signals are transferred between the MCP
and basic program via these parameters. The MCP is also monitored using parameter MCPxIn.
This is the reason why parameter MCPxBusAdr is not relevant for this MCP version.
Enter the pointer to the configured diagnostic address (e.g. P#A8190.0) in MCPxStatRec.
The PROFINET MCP has its own type which should be applied for parameter MCPBusType.
The FB1 parameters listed below are used for further parameterization. There is no PROFIBUS
version of the HHU. An Ethernet port for the HHU is shown in the diagram.
Figure 13-17 PROFINET connection
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
P3: Basic PLC program for SINUMERIK 840D sl
13.10 Structure and functions of the basic program
HHU
BHGMPI = FALSE
BHGStop
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