6. Redundancy with NX3030 CPU
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The CPU identification isn’t part of the redundant project developed with MasterTool. Such
identification is only in a CPU non-volatile memory area, which can be modified using MasterTool.
CAUTION:
The redundancy doesn’t work properly in case one of the CPUs isn’t identified as PLCA and
the other PLCB, when a process control interruption may occur. In case one NX3030 CPU
must be replaced (e.g. after a damage), the new CPU must be previously identified with the
same identification of the damaged one. The CPU display must be used to verify if both CPUs
are correctly identified.
Fifth Step – Redundant Project Downloading
This step describes the redundant project downloading in the CPU. This project must be prepared
according to the Redundant CPU Programming section.
A simple project (basic) can be prepared following, at least, the next sub-sections presented in this
section:
Wizard for a New Redundant Project Creation
Ethernet Ports Configuration in the CPU NX3030 (NET 1 and NET 2).
Obviously, it’s also possible to build a complete project and only later download it in the PLCA and
PLCB, for instance, in case these CPUs hardware aren’t available during the project developing in
MasterTool.
The first download of a redundant project in a CPU, previously identified as PLCA or PLCB, still
must be done using the IP address discovered in the first step, and selecting the third step of this
procedure.
The project download is run through the Online / Login menu.
ATTENTION:
Inside the developed project using MasterTool and downloaded in the CPU in this step, were defined
new IP addresses for the NET 1 interface in the PLCA and PLCB (IP_A_1 and IP_B_1), as well as a
IP address for the NET 1 interface in the Active CPU (IP_Active_1) – see Ethernet Ports
Configuration in the CPU NX3030 (NET 1 and NET 2) section.
Therefore, after this first download, the IP address discovered in the first step of this procedure
usually isn’t valid anymore. This IP Address change in NET 1 causes a connection loss between
MasterTool and the CPU, which is showed on the screen.
For further details regarding MasterTool reconnection, see MasterTool Connection with a NX3030
CPU from a Redundant PLC section.
MasterTool Connection with a NX3030 CPU from a Redundant PLC
After executing the procedure described in the Initial Downloading of a Redundant Project section in
both PLCs (PLCA and PLCB), MasterTool connection, through the NET 1 interface from NX3030
CPU can be made through one of the following addresses:
PLCA IP address: NET1 address exclusive for PLCA
PLCB IP address: NET1 address exclusive for PLCB
Independent from the PLC state, MasterTool can only connect to it using the PLC exclusive address,
configured in PLCX IP Address. But in case the PLC is in Active state, all other services can connect
to it either by the PLCX IP address or by the Active IP address.
To connect to a specific CP, at first a double-click must be done on the Device (NX3030 CPU) in the
Device Tree, go into “Communication Settings” tab, click on the Gateway and press “Scan Network”
button to list all PLCs detected by MasterTool in the network.
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