Mcp Switchover - Siemens SINUMERIK 840D sl Function Manual

● 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.
Activating/deactivating the MCP
If an MCP is assigned to the PCU in the NETNAMES.INI file, it is activated/deactivated as
part of the operating mode change. The MCP switchover in the PLC is called by the
operating mode change as a subfunction.
PCU changes operating mode
Active -> passive
Passive -> Active
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Several Operator Panels on Several NCUs, Distributed Systems (B3)
2.2 Several operator panel fronts and NCUs with control unit management option
– 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").
MCP is
Deactivated
Activated
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