6. Redundancy with NX3030 CPU
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could be synchronized. From version 2.01 this operation is no longer needed. After sending the
application the send operation for nonvolatile memory is performed automatically.
ATTENTION:
It’s important to remember that online modifications, without the option mentioned previously
selected, will be lost in case of a hot reset or a CPU switch off.
ATTENTION:
An online change in the declaration of retain variables of the application (adding or removing
variables) followed by a drop in the power CP before "Create Boot Application" will corrupt
retentive memory, because the value of the retain variables that were saved does not match the
retrieved application variables in the restored memory.
When the Non-Active PLC realizes that have a different project from the Active PLC, it executes the
following actions:
ï‚· Negotiates automatic project synchronization with the Active PLC
 In case it’s in the Stand-by or Starting state, it switches to the Not-Configured state and remains
in it until the projects are synchronized again. After that, returns automatically to the Stand-by
state
 In case it’s in the Not-Configured or Inactive state, the STAND-BY button from the PX2612
panel must be pressed or an equivalent command must be executed. This way, after the project
synchronization, it goes out from the Not-Configured state and can go to Stand-by state, or go
back to the Inactive state if there’s a failure
Off-Line Download of Modifications with Process Control Interruption
In the present section, it’s defined a procedure to execute an off-line download which interrupts the
process control. Such situation is acceptable in specific process types and during programmed
process stopping.
An off-line download from this type must be executed connecting MasterTool to the NET 1 channel
of the Active PLC using the exclusive IP address from the Active PLC (CLPX Active IP). Before
beginning an off-line in the Active PLC the user receives two MasterTool warnings:
Figure 6-25. Off-Line Download Warning
By pressing Yes, the project is downloaded. When an off-line download is performed, the process’
control is interrupted, because the project is sent to the Active PLC, which will leave the Run state,
and therefore will be in the Not-Configured state.
Another important point is that if the other PLC is in Stand-by state, it must be switched to Inactive
state, e.g. pressing the PX2612 INACTIVE button on this PLC. This way, the turn off of this PLC by
the other PLC and its take over as Active is avoided.
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General