Plc/Mcp/Hhu Interface - Siemens SINUMERIK 840D sl Function Manual
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- Function manual (2184 pages) ,
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13.9.3
PLC/MCP/HHU interface
General
There are 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 the SINUMERIK 840D sl, the machine control panel (MCP) and handheld unit (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 operating unit.
Topology SINUMERIK 840D sl
On the 840 D, the machine control panel and the handheld unit are connected to the CP 840D
sl Ethernet bus (see Figure below). 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 at FB1. The NC-related signals are generally distributed by the basic
program to the NC/PLC 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 Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
P3: Basic PLC program for SINUMERIK 840D sl
13.9 Interface structure
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