Siemens SINUMERIK 840D sl Function Manual

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Several Operator Panels on Several NCUs, Distributed Systems (B3)ExamplesExtended Functions208 Function Manual, 03/2009, 6FC5397-1BP10-4BA0The falling edge combined with the sequence described above signals to the online PLC thatthe operator panel has broken off the link to the online NCU. If an MCP is assigned to theoperator panel and activated, it must now be deactivated by the PLC.The PLC also ceases to monitor the HMI sign of life signal.Passive operating mode is set in the PLC for the operator panel which has been suppressed.See "Active/passive operating mode" further below.Negative: OFFL_CONF_PLC/MMC_LOCKEDProcesses that cannot be interrupted are running on the operator panel (e.g. operation viaRS-232 or data transfer between NCU and PCU).The operator panel remains online to the current NCU.Operating focus switchover in server modeA server maintains a permanent link to the NCUs to which it is assigned. The operator canswitch the operating focus from one NCU to another without interrupting the existing link.If the operator wishes to switch the operating focus to another NCU, the focus PLC andtarget PLC must first be interrogated to determine whether they will permit a focusswitchover.The operator panel first sends the focus offline request signal (OFFL_REQ_FOC/OK) to thefocus PLC.After a positive acknowledgement (OFFL_CONF_FOC/OK) from the focus PLC, the operatorpanel sends query signal ONL_REQ_FOC/OK regarding focus changeover to the target PLC.After the operator panel has received permission from the target PLC to switch the operatingfocus (ONL_PERM_FOC/OK), the operator panel logs off from the focus PLC withS_ACT/DISC_FOCUS and switches the focus to the target PLC.The operator panel must finally request active operating mode in the target NCU. Theprevious focus PLC must set active operating mode for this HMI-PLC interface afterreceiving S_ACT/DISC_FOCUS and deactivate any active MCP assigned to the operatingpanel which has gone offline.See: Active/passive operating modeActive/passive operating modeAfter an operator panel has gone online to an NCU, it can assume one of two differentoperating states:Active mode: Operator can control and monitorPassive mode: Operator sees header information and the "passive" status identifier.After switching to an NCU, it first requests active operating mode in the online PLC.If two operator panels are linked online simultaneously to an NCU, one of the two is alwaysin active mode and the other in passive mode.The operator can request active mode on the passive operator panel at the press of a button.