Mcp Switchover - Siemens SINUMERIK 840D sl Function Manual

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
2.2 Several operator panel fronts and NCUs with control unit management option
Rules for operating mode switchover
The following rules apply to changes of operating mode (see also Sections "Suppression",
"Suppression strategy"):
● A PCU/HT6 which goes online on an NCU is assigned the active operating mode on this
● If two PCUs/HT6s are online, the operating mode is changed by pressing the key ("Input",
● The change from the active to the passive operating mode can be rejected by the
● If an online request is issued by a PCU/HT6
● If two PCUs are online on one NCU and the previously active PCU/HT6 goes offline, it
2.2.13

MCP switchover

An MCP cannot be switched over independently of the PCU it is assigned to. It can be
switched over only if
● the PCU switches over and
● the MCP address is defined in the HMI parameter block of NETNAMES.INI (see Section
● MCP_enable is set in the control unit switchover function on the PLC.
124
NCU.
If another PCU/HT6 was previously active on this NCU, it changes to passive mode,
provided this is permitted by the PLC.
ENTER, RETURN) used to select the active operating mode.
PCU/HT6 if the current HMI application cannot be aborted or if it is still in progress.
Similarly, active mode cannot be selected on a PCU/HT6 if the other PCU/HT6 currently
linked to the NCU cannot be switched to passive mode.
– and no PCU/HT6 is currently online:
The PCU/HT6 issuing the request goes online and switches to active mode.
If an MCP is assigned to the PCU, this is activated by the PLC.
– and a PCU/HT6 is currently online:
This PCU/HT6 switches to passive mode and is suppressed.
The requesting PCU/HT6 goes online.
first switches to passive mode. Then the second PCU/HT6 switches to active mode and
the first PCU/HT6 disconnects the link to the NCU.
Note
The HMI type is assessed as a priority for the suppression strategy. See Section
"Suppression".
If the active PCU/HT6 cannot be switched to passive mode, then the requesting
PCU/HT6 is switched to passive mode.
"Structure of configuration file").
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions