6. Redundancy with NX3030 CPU
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Maintenance
Modules Hot Swapping in a Redundant PLC
In case of failure in a module from one of the PLCs (PLCA and PLCB), the module hot swapping
may be necessary, without interrupt the process control. For that, the following steps must be
followed:
Verify if the half-cluster which won’t be modified is in Active or Stand-by state, allowing it to
take the process control
To put the half-cluster having its module changed in Inactive state, through the Redundancy
Control Panel PX2612 or the Redundancy Commands
Execute the necessary exchanges in the Inactive half-cluster, as indicated in the CPU
Configuration – General Parameters –How to do the Hot Swap chapter
To put the half-cluster back to Stand-by or Active state, according to necessity
MasterTool Warning Messages
When MasterTool is with a redundant project open, or when it’s connected to a NX3030 CPU
identified as PLCA or PLCB, some special warning messages may occur, as described in the
following sub-sections.
Blocking of Redundant or Non-Redundant Project Download
MasterTool doesn’t allow the download of a redundant project, unless the CPU is NX3030 and is
identified as PLCA or PLCB (see NX3030 CPU Identification section).
On the other hand, MasterTool doesn’t allow the download of a non-redundant project in a NX3030
CPU identified as PLCA or PLCB.
In case any of these illegal actions is tried, MasterTool warns with a correspondent message.
Warnings before Commands which may stop the Active PLC
Some commands, as the following, may stop a PLC:
Offline load after Online / Login
Debug / Stop
Debug / New Breakpoint
Online / Reset (warm, cold, origin)
In case MasterTool is logged to the Active PLC, and one of these commands is tried, before sending
it to the Active PLC, MasterTool sends the following message and waits for authorization:
“If the other PLC is in Stand-by State, it will assume as Active and turn-off this PLC. If not, this
won’t happen, but the automated process will no longer be controlled.”
Warning before Logging to the Non-Active PLC
In normal circumstances, it isn’t usual MasterTool to connect to the Non-Active PLC. This way,
when there’s a try to execute this type of command, MasterTool sends the following warning:
“You are logging in to a Non-Active PLC, and this is not usual. Are you sure you want to execute this
command?”
On the other hand, there are circumstances (not so usual) in which it’s necessary to login in the Non-
Active PLC, and in these cases the user must authorize the login. Such circumstances may occur,
e.g.:
For initial configurations, as described in Initial Downloading of a Redundant Project section
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General