I/O expansion modules

vNet uses fixed positions for supported ADAM I/O expansion modules.

Each position is tied to one module family. When that position is enabled during configuration, the channels from that module are added to the system.

The fixed position and the fixed vNet node belong together in the standard vNet layout. They are not selected freely during setup.

Use this page to see which supported module belongs to each fixed position.
Then use Configuration to enable only the positions that are physically installed.
Use I/O mapping afterward to verify the resulting system channel numbering.

Supported modules

Use the table below to see which module type belongs to each fixed position and how many extra channels it adds when enabled.

Position is the fixed setup slot used in the vNet documentation and configuration.
vNet node is the fixed RS485 module address used by that slot on the vNet bus.
Channels is the number of extra system channels added when the position is enabled.

I/O group	Position	vNet node	Module	Channels	Typical use
Analog input	1	11	ADAM 4017	8	Additional analog measurements
Analog input	2	13	ADAM 4017	8	Additional analog measurements
Analog input	3	15	ADAM 4017	8	Additional analog measurements
Analog input	4	17	ADAM 4017	8	Additional analog measurements
Analog output	1	21	ADAM 4024	4	Additional analog control signals
Analog output	2	23	ADAM 4024	4	Additional analog control signals
Analog output	3	25	ADAM 4024	4	Additional analog control signals
Analog output	4	27	ADAM 4024	4	Additional analog control signals
Digital input	1	31	ADAM 4051	16	Additional digital inputs
Digital input	2	33	ADAM 4051	16	Additional digital inputs
Digital input	3	35	ADAM 4051	16	Additional digital inputs
Digital output	1	41	ADAM 4056	12	Additional digital outputs
Digital output	2	43	ADAM 4056	12	Additional digital outputs
Digital output	3	45	ADAM 4056	12	Additional digital outputs
Combined digital I/O	1	51	ADAM 4055	8 / 8	Extra digital inputs and outputs in one module
Combined digital I/O	2	53	ADAM 4055	8 / 8	Extra digital inputs and outputs in one module
Relay output	1	61	ADAM 4069	8	Additional relay outputs
Relay output	2	63	ADAM 4069	8	Additional relay outputs

Total capacity

Category	Maximum capacity	Based on
Analog inputs	32	4 x ADAM 4017 with 8 channels each
Analog outputs	16	4 x ADAM 4024 with 4 channels each
Digital inputs	64	2 x ADAM 4055 with 8 inputs each plus 3 x ADAM 4051 with 16 inputs each
Digital outputs	68	2 x ADAM 4055 with 8 outputs each plus 3 x ADAM 4056 with 12 outputs each plus 2 x ADAM 4069 with 8 outputs each

The positions are fixed. Only enabled modules add channels to the system.

Relay output modules still become output channels in the system. Their final channel numbering is explained on I/O mapping.