Ncu Replacement - Siemens SINUMERIK 840D sl Function Manual

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
2.3.5

NCU replacement

The procedure for NCU replacement or configuration of an additional NCU is similar to that
for commissioning (see "Power up").
Variant 1
1. Establish 1:1 connection between PCU and NCU
2. Power up HMI on NCU with bus address "13" (see above)
3. Enter new NC address via the Commissioning/NC/NC address operating area and boot
4. Rewire bus for M:N operation
Variant 2
1. The NCU which is the "power-up NCU" for a PCU connected to the bus is disabled. (The
2. Power up HMI on NCU with bus address 13 (see above)
3. Enter new NC address via the Commissioning/NC/NC address operating area and boot
4. Reactivate "Power-up NCU" again
Data exchange between NC<->PLC
In configurations consisting of 1 x PCU and n x NCUs, it is often necessary to synchronize
the NCUs.
The following synchronization options are available:
● NCK I/Os on drive bus (digital, analog, writing of NC and PLC).
● PLC I/Os (I/O link).
● Link via PROFIBUS DP.
● Link via Global Data function of SIMATIC S7.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
NCU.
HMI powers up at the first connection configured in the NETNAMES.INI file)
NCU.
Note
Please note:
• Bus address 13 must be reserved for servicing purposes (and should not be assigned
to a bus node).
• HMI Embedded:
The length of the names in the file NETNAMES.INI (configuration of channel menu) is
limited to five characters.
• HMI Advanced:
The "mstt_address" data item is not evaluated, it is used for documenting the bus
nodes. If the channels are located on different NCUs, "m:n" must be entered in the
Commissioning/HMI/Operator panel operating area.
2.3 Several operator panel fronts and NCUs, standard functionality
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