Siemens SINUMERIK 840D sl Function Manual page 1317

Simple implementation of a user program on the new alarms
In the source container of the basic program there is a file udt2_for_Convert.awl, which
contains the structure elements
ChanA as Array of 1 .. 8,
AxisA as array of 1 .. 18 and
UserA as array of 1 .. 31
from UDT1002. This UDT2 is to be compiled via the KOP/FUP/AWL - Editor.
The UDT2 must be assigned to the DB 2 in the symbol table.
After the sources from the blocks, which are allocated to the DB 2 (alternatively all blocks
can also be generated as sources) have been created, the DB 2 is assigned to the UDT1002
in the symbol table. Thereafter the sources are recompiled.
Now all the alarm allocations are assigned to the new data areas in the DB 2 and now only
the parameter "ExtendAlMsg" at FB 1 must be set to True .
After a Power On RESET the alarm behavior is the same as earlier.
2.6.3 PLC/MCP/HHU interface
General
There are three different connection options for the machine control panel (MCP) and the
handheld unit (HHU). This is in part due to the history of the MCP and HHU. This description
focuses primarily on the connection of the Ethernet components.
On SINUMERIK 840 D, the machine control panel (MCP) or HT8 (MCP) and handheld unit
HT1, HT2 (HHU) are connected via the Ethernet bus, which also links the TCU to the NCU.
The advantage of this is that only one bus cable is required to connect the operator unit.
Topology SINUMERIK 840D
On the 840 D, the machine control panel and the handheld unit are connected to the CP
840D sl Ethernet bus (Fig. 9). Where the connection of further keys and displays is required
for customized operator panels, an additional keyboard interface (machine control panel
without operating unit) can be used. For each keyboard interface, 64 pushbuttons, switches,
etc. and 64 display elements can be connected via ribbon cable.
The signals sent from the MCP are copied to the PLC's DPR (Dual Port RAM) by the
integrated Ethernet CP-840D sl. The basic program of the PLC enters the incoming signals
in the input image configured on FB1. The NCrelated signals are generally distributed by the
basic program to the VDI interface. If required, the signals can be modified by the user.
The signals from the PLC to the MCP (displays) are transferred in the opposite direction.
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Detailed description
2.6 Interface structure
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