Z2: NC/PLC interface signals
18.2 Distributed systems (B3)
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
849
Name: Status Z_INFO Meaning
ONL_REQ_FOC Set
Server HMI would like to set the operating focus on this NCU and
outputs an online focus request.
ONL_PERM_FOC Set
PLC positively acknowledges the online focus request.
Server HMI then connects operating focus to this NCU.
ONL_PERM_FOC PLC_LOCKED
PLC negatively acknowledges the online focus request. User has set
HMI switchover disable, server HMI cannot set operating focus,
MMCx_SHIFT_LOCK = TRUE,
x=1 or 2, first or second HMI-PLC interface.
18.2.2 Interfaces in DB19 for M:N
The HMI/PLC interface in DB19 is divided into three 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 type -> 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.
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