6. Redundancy with NX3030 CPU
330
Step 10 – Projects Synchronism Enabling in the Active PLC
In the step 5, the project synchronism was disabled in the Non-Active PLC. It can be observed this
PLC is now in Active state.
In this step, the project synchronism must be enabled again in this PLC. The screen and methodology
used for it were described in the section Project Synchronization Disabling. But this time we need to
select the “Enable” option from the combo-box. MasterTool must be connected to the Active PLC
(see MasterTool Connection with a NX3030 CPU from a Redundant PLC section).
After enabling the project synchronism in the Active PLC, the user must verify if this command was
successful, verifying if DG_NX4010.tRedundancy.RedDgnLoc.sGeneral_Diag.
bProjectSyncDisable= 0 in the Active PLC.
As soon as the project synchronism is enabled again, the following action sequence is expected:
The Non-Active PLC (Stand-by state), which already knows the different between both projects;
goes out from the Stand-by state and goes to the Not-Configured state
The modified project (new) is copied from the Active PLC to the other, temporarily in Not-
Configured state
As soon as the projects are synchronized again, the Not-Configured PLC goes to Starting state
and then it’s supposed to go back to Stand-by state
Step 11 – Optional Reorganization of PLC and PROFIBUS Networks in Active State
At the end of the procedure, for standardization or organization reasons, the user may execute a
switchover for the PLCA assumes as Active, and for all remotes PROFIBUS heads in Active state
are in the network A.
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General