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6. Redundancy with NX3030 CPU

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The modifications that must be loaded off-line, and supported by this procedure do not affect the

structure of redundant variables.

However, some modifications which can be loaded on-line can change the structure of redundant

variables, e.g.:

 Insertion of symbolic variables (redundant or not) within a POU or GVL existing or in a new

POU or GVL

 Removal of symbolic variables (redundant or not) within a POU or within existing GVL. The

removal of a POU or GVL can also involve the removal of symbolic variables

 Change in size/structure of symbolic variables (redundant or not) in an existing POU or GVL

Step 3 – Previous Project Backup

Before editing the modifications that must be loaded off-line without interrupting the process control,

for safety reasons a backup of the project previous version must be run. It may be necessary to

reinstall the previous version in case an error is committed during this procedure executing.

ATTENTION:

The backup recommendation for all loaded versions in the PLCs may not be followed only in this

specific procedure. It must be a usual practice.

Step 4 – Cares in Editing the Off-line Downloaded Modifications

The off-line downloaded modifications through this procedure, usually, are the following:

 Insertion of new devices in the devices tree

 Property or parameter change in devices existing in the devices tree

Such devices are normally the following:

 Modules such as PROFIBUS master (NX5001) or Ethernet modules (NX5000)

 Ponto Series PROFIBUS remotes

 I/O modules inside Ponto Series PROFIBUS remotes

 Modbus communication I/O drivers

 Mapping of Modbus communication drivers

The following cares must be taken at editing these project modifications:

 If a device existed in the previous project version, and continues existing in the modified version,

the %I and %Q variables allocated for it must remain the same (command, diagnostic, inputs and

outputs). Care must be taken for the inserted modifications don’t change such allocations

 If a device was inserted in the modified project version, the %I and %Q variables allocated for it

must not be allocated in the previous project version (command, diagnostic, inputs and outputs)

Step 5 – Inactive PLC Project Synchronism Disabling

In the procedures described in the On-Line Download of Modifications and Off-Line Download of

Modifications with Process Control Interruption sections, the project is automatically synchronized

from the Active PLC to the Non-Active PLC.

However, during the procedure of off-line downloading without process control interruption, the

project synchronism must be temporarily disabled.

The Project synchronization disabling is explained in the section Project Synchronization Disabling

and must be executed in the Non-Active PLC.

Step 6 – Physical Modifications Executing

At this moment, the physical modifications can be executed, such as:

Brand	ALTUS
Model	Nexto NX3004
Category	Processor
Language	English

ALTUS Nexto NX3004 User Manual

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ALTUS Nexto NX3004 Specifications