I/O mapping

vNet channels continue after the built-in I/O of the same type. This is the main rule when signals, alarms, logic, or outputs are configured in the system.

Use this page when you need to know which final system channel number an enabled vNet point receives after commissioning.

Built-in channels of the same type always come first.
Enabled vNet channels continue after the last built-in channel of that same type.
If more than one vNet module of the same type is enabled, the next module continues after the previous one.
The rule is separate for digital inputs, digital outputs, analog inputs, and analog outputs.
Unused module positions do not reserve channel numbers.

In simple terms: final system channel number = built-in channel count of that type + local channel number on the added module.

How to read the examples

Start with the built-in channel count for the same I/O type.
Then continue with the channels from the enabled vNet module.
The final system number is the number used later in the installation logic.

The starting number is not always the same on all equipment types. It depends on the built-in I/O count of the selected equipment.

Example: digital inputs

The base unit already uses digital inputs 1 to 8.

If the first vNet digital input module is enabled, its first channel becomes digital input 9 in the system.

Here, the input number on the added module means the local channel number on that ADAM module itself. That local channel number is then continued into the system numbering after the built-in inputs. Input 1 becomes 9, input 2 becomes 10, and input 16 becomes 24.

Local input number on added module	Becomes system digital input number
1	9
2	10
8	16
16	24

Example: digital outputs

The base unit already uses digital outputs 1 to 4.

If the first vNet digital output module is enabled, its first channel becomes digital output 5 in the system.

Here, the output number on the added module means the local channel number on that ADAM module itself. That local channel number is then continued into the system numbering after the built-in outputs. Output 1 becomes 5, output 2 becomes 6, and output 12 becomes 16.

Local output number on added module	Becomes system digital output number
1	5
2	6
8	12
12	16

Combined digital I/O modules

An ADAM 4055 adds both digital inputs and digital outputs.

Its 8 inputs continue in the digital input numbering.
Its 8 outputs continue in the digital output numbering.
The input side and output side do not share one common channel range.

Analog I/O

The same principle is used for analog inputs and analog outputs.

Built-in analog channels come first.
Enabled vNet analog channels continue after the built-in channels of the same type.
Analog input numbering and analog output numbering are separate.

Operation and messages

If vNet is disabled, the expansion modules are not used by the system.
If the vNet network is missing, the system can report an operating message.
If a configured module does not respond, the system can report an operating message or alarm.
Internal numeric status codes are service details and are normally not needed for normal operation.