August 1, 2010
The memory of Modicon systems is divided into four basic areas – discrete inputs, discrete outputs, input registers, holding registers. In Modicon systems, these areas are addressed absolutely (see the "Modicon addressing" column in the table below). In a Reliance project, tags are addressed relatively always starting at 0 (see the "Reliance addressing" column in the table below).
| Memory area | Modicon addressing | Reliance addressing | |
|---|---|---|---|
| Register type | Address | ||
| 1. Discrete outputs (Coils) | from 00001 | Outputs (Coils) | from 0 |
| 2. Discrete inputs | from 10001 | Inputs | from 0 |
| 3. Input registers | from 30001 | Input registers | from 0 |
| 4. Holding registers | from 40001 | Holding registers | from 0 |
In a Reliance project, a tag at 40011 is configured this way:
Register type: Holding registers; Address: 10
For more information, go to the page with a description of Modbus Communication Driver.
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