6. Redundancy with NX3030 CPU
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into the group of Modifications which Allow On-Line Download, is possible to do an On-Line
Download of Modifications with no generation of incompatibility of applications between the PLCs.
Project Update due to MasterTool IEC XE Update
The MasterTool IEC XE programming tool is under a constant enhancement process, improving its
features and adding new ones. When it is necessary to update the tool in a redundant system, the used
project also needs to be updated. This update is done through the Project/Project Update menu,
available in the tool. After updating the project, the Off-Line download without Process Control
Interruption can be done.
Updating Project from Versions Previous to 2.00 to version 2.00 or Higher
Among the MasterTool IEC XE version changes there is a special case that must be planned more
carefully to avoid stopping the process. The update of a project created with a version prior to 2.00 of
the MasterTool IEC XE to version 2.00 or higher causes a reconfiguration in the area allocated for
the Persistent Variables object. This reconfiguration was implemented aiming at optimizing the
allocation of this area. However, if this object is present and marked as redundant in a project, this
reconfiguration won’t allow the data to be synchronized between the two project, always setting one
of the Half-Cluster in Inoperative State.
This way, if this situation happens, the NX3030 CPU software can detect it and stop the
synchronization of the Persistent Variables object data until the two Half-Clusters’ projects are the
same, and, therefore, are using a project with the updated MasterTool IEC XE version. This situation
won’t stop the process, but if a correct update sequence is not followed, the data of the Persistent
Variables object can be restarted.
In this case, the Off-Line Download sequence below must be followed:
ï‚· Change the Half-Cluster in Active state project, unmarking the PersistentVars object inside the
Redundancy Configuration object. This download must be done as an On-Line change and for
this to happen another change in the project must be done, e.g. declaring a new variable inside
the NonSkippedPrg POU
 After the On-Line change, it’s necessary to run the command Create Boot Application while on-
line, with the PLC in Active state. This is necessary so that the application is synchronized with
the Half-Cluster that passed to Non-Configured state after the download.
ï‚· Update the project from version lower than 2.00 to version 2.00 or higher through the
Project\Project Update menu in MasterTool IEC XE
ï‚· Disable the Project Synchronization through the Communication\Redundancy Configuration
menu
 Download the updated Project into the Half-Cluster that’s in Stand-by state. A message will be
displayed indicating the PersistentVars object memory area reorganization. The procedure must
continue and by the end of the project download the Half-Cluster will remain in STOP with a
redundancy state as Not-Configured
ï‚· Put the CPU in RUN. The Half-Cluster will change to Starting state and then to Stand-by. The
Half-Cluster will synchronize its data with the one that’s in Active state.
ï‚· The data from the PersistentVars object must be copied from the Active Half-Cluster to the
Stand-by manually or the receipt resource must be used
ï‚· Put the Active Half-Cluster to Stand-by. With this action, the other Half-Cluster will go to
Active.
ï‚· Enable the Project Synchronization through the Communication\Redundancy Configuration
menu. After this, the Half-Cluster in Stand-by sate will go into Not-Configured state and will
receive the project from the Half-Cluster in Active state. By the end of this process, the Half-
Cluster state will go to Starting and then back to Stand-by.
ï‚· Change the Project of the Half-Cluster in Active state marking the PersistentVars object inside
the Redundancy Configuration object. This download must be done as an On-Line change, and
for this to happen, another change in the project must be done, e.g. removing the variable
declared at the beginning of this process.
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