System Features - Siemens SINUMERIK 840D sl Function Manual

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
2.1.2.2

System features

M:N concept
This concept allows the user to connect any control units to any NCUs in the system (within
the limits imposed by the hardware) via the bus and to switch them over as and when
required.
NCU link
NCU link is an additional direct connection between the NCUs which enables fast
communication.
New features
New features connected with the"control unit management" option are as follows:
● Independent connection of PCU and MCP
● Two independent HMI connections for each NCU:
● Different bus systems (MPI/OPI) between PCU/MCP/HT6 and NCUs
● HMI function as server/as main, secondary control panel
● A combination of both fixed and switchable operator panels can be connected.
● Suppression mechanism (priority-controlled) if more than two PCUs are competing for an
● Up to 32 bus nodes (PCUs, MCPs, HT6s and/or NCUs)
● PLC controls the switchover process (control unit switchover to toolbox, directory
● Configuration file NETNAMES.INI with new parameters
Supplementary conditions
At any one time:
● A max. of two PCUs/HT6s can be online on one NCU.
● Only one of them can be in the active state.
● The same value must be entered in HT6 for the PCU and the MCP address (because the
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
– PCU and MCP can be switched over together, or the PCU on its own.
– HMI states:
- online/active: Operation and monitoring
- online/passive: A window is displayed with header and alarm line and
a message indicating the "passive" state
- offline
(Changes do not take effect until after power up.)
NCU connection
PSP_PROG\m_zu_n.zip)
MCP addresses can only accept values up to 15, the PCU address is limited).
2.1 Brief description
85