P3: Basic PLC Program for SINUMERIK 840D sl
13.8 Structure and functions of the basic program
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
899
Figure 13-17 840Dsl: PROFIBUS connection
MCP failure normally switches the PLC to the STOP state. If this is undesirable, OB 82, OB 86 can be used to
avoid a stop. The basic program has, as standard, the OB 82 and OB 86 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 SFC 12. If the PLC does not switch to
the stop state following the failure of or a fault on the MCP, an alarm message will be generated via the basic
program. The interrupt is deleted when the station recovers.
Relevant parameters (FB 1)
MCP HHU
MCPNum = 1 or 2 (number of MCPs) HHU = 5 (via CP 840Dsl)
MCP1In MCP2In BHGIn
MCP1Out MCP2Out BHGOut
MCP1StatSend (n.r.) MCP2StatSend (n.r.) BHGStatSend
MCP1StatRec MCP2StatRec BHGStatRec
MCP1BusAdr MCP2BusAdr BHGInLen
MCP1Timeout MCP2Timeout BHGOutLen
MCP1Cycl (n.r.) MCP2Cycl BHGTimeout (n.r.)
MCPMPI = FALSE BHGCycl (n.r.)
MCP1Stop MCP2Stop BHGRecGDNo
MCPBusType = b#16#33 BHGRecGBZNo (n.r.)
BHGRecObjNo (n.r.)
MCPSDB210= FALSE BHGSendGDNo (n.r.)
MCPCopyDB77 = FALSE BHGSendGBZNo (n.r.)
BHGSendObjNo (n.r.)
BHGMPI = FALSE
BHGStop
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