Application and function of the Wilo Net interface

Wilo Net is a bus system which enables up to 21 Wilo products (participants) to communicate with one another.

Application for:

Generic twin-head pump
Two-pump system consisting of two single pumps (Y-pipe installation)
Multi-Flow Adaptation (feeder pump connected to secondary pumps)

Bus topology:

The bus topology consists of multiple participants (pumps), which are switched on in sequence. The participants are connected to each other via a common cable.
The three Wilo Net terminals (H, L, GND) must be wired with a communication cable from pump to pump. Incoming and outgoing cables are clamped in a terminal.
The bus must be terminated at both ends of the line. This is done for the two external pumps in the pump menu. All other participants should not have activated termination.

All bus subscribers must be assigned an individual address (Wilo Net ID). This address is set in the pump menu of the respective pump.

To terminate the pumps:

In the “Settings” menu , select

“External interfaces”
“Wilo Net setting”
“Wilo Net termination”.

Possible selection:

Wilo Net termination	Description
Switched on	The termination resistor of the pump is switched on. If the pump is connected at the end of the electrical bus line, “Switched on” must be selected.
Switched off	The termination resistor of the pump is switched off. If the pump is NOT connected at the end of the electrical bus line, “Switched off” must be selected.

After termination is done, an individual Wilo Net address is assigned to the pumps:

In the “Settings” menu , select

“External interfaces”
“Wilo Net setting”
“Wilo Net address” and assign each pump its own address (1 to 20).

Twin-head pump example:

Pump head left (l)

Wilo Net termination: ON
Wilo Net address: 1

Pump head right (II)

Wilo Net termination: ON
Wilo Net address: 2

Number of Wilo Net participants

A maximum of 21 participants (from pump software SW 01.04.19.00) can communicate with each other in Wilo Net. Each individual node counts as a participant, i.e. a twin-head pump/two-pump system consists of two participants.

NOTICE

If a Multi-Flow Adaptation system is made up of twin-head pumps, this means a maximum of 5 twin-head pumps can communicate with each other via Wilo Net in the MFA network. In addition to this maximum of 5 twin-head pumps, up to 10 additional single pumps can be included in the network.

Other examples

The primary circuit pump of a Multi-Flow Adaptation system is a twin-head pump.

Primary twin-head pump/two-pump system = 2 participants (e.g. ID 1 and ID 2)
Accessories = 1 participant (e.g. ID 21)

A maximum of 18 pumps remain on the secondary side in the MFA system (ID 3 to 20).
In the Wilo Net settings, the Wilo Net ID address space of 1 to 126 is displayed as adjustable.
However, only the ID address space of 1 to 21 is available for a functioning Wilo Net connection between pumps and accessories. A maximum of 21 participants can therefore communicate in Wilo Net.
Higher IDs mean that Wilo Net participants with higher IDs cannot communicate correctly with the other participants.

The smallest Wilo Net “communication network” consists of two participants (e.g. with twin-head pumps or two single pumps as two-pump system). Usually the participants are then operated with ID 1 and ID 2. However, any other combination of IDs 1 to 21 is possible as long as both IDs are different.

NOTICE

When replacing a Wilo-Stratos MAXO pump with SW ≥ 01.04.19.00 in an existing Multi-Flow Adaptation system with pumps that have a lower SW version (SW < 01.04.19.00), all integrated Wilo-Stratos MAXO pumps must be updated to a higher SW version (SW ≥ 01.04.19.00).