Interfaces In Db19 For M:n - Siemens SINUMERIK 840D sl Function Manual

NC/PLC interface signals (Z2)
19.2 Several Operator Panels on Several NCUs, Distributed Systems
19.2.2

Interfaces in DB19 for M:N

The HMI-PLC interface in DB19 is divided into 3 areas
Online request interface
The online request sequence is executed on this interface if a control unit wants to go online.
HMI writes its client ID to ONL_REQUEST and waits for the return of the client ID in
ONL_CONFIRM.
After the positive acknowledgement from the PLC, the control unit sends its parameters and
waits for online permission (in PAR_STATUS, PAR_Z_INFO).
HMI parameter transfer:
Client identification -> PAR_CLIENT_IDENT
HMI-Typ -> PAR_MMC_TYP
MCP address -> PAR_MSTT_ADR
With the positive online permission, the PLC also sends the number of the HMI-PLC online
interface DBB109.4-7 to be used by the control unit.
The MMC then goes online and occupies the online interface assigned by the PLC.
Online interfaces
Two control units can be connected online to one NCU at the same time.
The online interface is available for each of the two online control units separately.
After a successful online request sequence, the control unit receives the number of its online
interface from the PLC.
The HMI parameters are then transferred to the corresponding online interface by the PLC.
The control unit goes online and occupies its own online interface via which data are then
exchanged between the HMI and PLC.
HMI data interfaces
User data from/to the HMI are defined on these:
● DBB 0-49 control unit 1 interface
● DBB 50-99 control unit 2 interface
These data and signals are always needed to operate control units.
M:N sign-of-life monitoring
This is an additional monitoring function which must not be confused with the HMI sign-of-life
monitor. For further information, please refer to the relevant signals.
In certain operating states, control units with activated M:N switchover (parameterizable in
NETNAMES.INI) must be capable of determining from a PLC data whether they need to wait
or not before linking up with an NCU.
1014
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions