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Modbus Integrator's Guide for the Cordex® CXC HP Controller | 3 - Using Modbus

Not all register addresses will be populated with data. For example, the controller does not actually have

any coils (relays). A request for coil data at address 1 will return zero.

The Modbus reference table on the controller web interface provides specific addresses for particular data

points.

Modbus reference tables

Modbus addressing follows these rules when changing system configuration:

• When an item is created, such as custom data, or a shunt, the item is assigned Modbus addresses

for its data. These addresses will not change unless the item is removed, or the Re-number

Modbus Table by Name button is selected.

• Removing an item leaves a gap in the address table. If a new item is created, it will fill the next

available address. If there are no gaps, it is added to the end

• Modbus addresses are local to the controller. They cannot be transfered. If necessary, to align

Modbus addresses between identical or similar systems, see the procedure in the How to create

identical modbus structure section.

• When importing a configuration, the newly imported items are sorted by name first, then assigned

the first available Modbus address. Existing Modbus addresses are not changed.

3.4. How to create an identical Modbus structure

The dynamic nature of creating and configuring a controller means that Modbus addresses may not

be identical between identical systems. These instructions describe how to create the same Modbus

structure between identical systems. If you are using the Limited Data Set only, then the Modbus

addresses are already static and it is not necessary to follow these instructions. If you are using a full

Modbus system data set, follow these instructions:

0350114-J0 Rev N Page 13

EnerSys Alpha Cordex CXC HP Integrator Guide

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