ALTUS Nexto Series User Manual

6. REDUNDANCY WITH NX3030 CPU
6.5.2. 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:
IP Address PLC A: NET 1 address exclusive for PLCA
IP Address PLC B: NET 1 address exclusive for PLCB
Independent from the PLC state, MasterTool can only connect to it using the PLC exclusive address, configured in IP
Address PLC X. But in case the PLC is in Active state, all other services can connect to it either by the IP Address PLC X or
by the IP Address Active.
To connect to a specific PLC, at first a double-click must be done on the Device (NX3030) 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.
On this list it’s possible to find the following standard identifications, in case the PLC name on the network hasn’t been
changed previously by the user:
NX3030_<IP address>_PLCA: identification related to the PLCA. In this case, the field <IP address> must be the same
as the IP Address PLC A configured in the project.
NX3030_<IP address>_PLCB: identification related to the PLCB. In this case, the field <IP address> must be the same
as the IP Address PLC B configured in the project.
Next, the PLC which MasterTool is to connect must be selected from the list and the button “Set Active Path” must be
pressed. Then, at executing the command from the Online / Login menu, MasterTool connects to this PLC.
ATTENTION
MasterTool can only connect to one PLC at a time. To connect to several PLCs, multiple
instances must be open in MasterTool, when care must be taken to open the correct project
in each instance.
6.5.3. Modification Download in a Redundant Project
After both PLCs (PLCA and PLCB) from the redundant pair had its initial program already downloaded, as described in
the Initial Downloading of a Redundant Project section, it’s possible to download successive changes in the project, when
such changes are necessary.
MasterTool connection to the PLCs responsible for the modifications download must be executed as described in Mas-
terTool Connection with a NX3030 CPU from a Redundant PLC section. In this section it is explained how it’s possible to
connect to a specific PLC (PLCA or PLCB), to the Active PLC or to the Non-Active PLC.
Usually the modifications must be downloaded to the Active PLC and next automatically synchronized with the Non-
Active PLC, through synchronism channels NETA/NETB. Therefore, MasterTool normally must use the Active PLC exclusive
IP address (IP Address PLC X) to connect to NET 1 channel from the NX3030 CPU in the Active PLC. In order to verify
which PLC is in Active state, the same step described in Initial Downloading of a Redundant Project - Forth Step – Identifying
the NX3030 CPU and Verifying the CPU Display can be followed.
ATTENTION
To download a project in the Non-Active PLC is usually useless as the project automatic syn-
chronization (Active to Non-Active PLC) would cancel the effect of this download. How-
ever, there are special situations when the project synchronization must be disabled tem-
porarily, being possible and useful to download a different project in the Non-Active PLC.
These special situations are discussed in the Exploring the Redundancy for Offline down-
loading of Modifications without Interruption of the Process control section.
6.5.4. Offline and Online Modifications Download
Project modifications may be downloaded offline or online.
Offline downloads require the PLC, where the downloaded is supposed to be executed, stopping. On the other hand, online
downloads allow the PLC to continue executing its application while the modification is downloaded.
Some modification types require offline download and can’t be executed online in the PLC where MasterTool is connected.
In this case, there are two options:
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ALTUS Nexto Series Specifications

General

Brand	ALTUS
Model	Nexto Series
Category	Computer Hardware
Language	English