Building automation

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Simple and proven: the Wilo PLR protocol

PLR is the proven Wilo protocol for communication with pumps. It is based on a point-to-point connection and manages without addressing. Many existing connections to building automation are based on this technology. PLR is a classical point-to-point connection between the pump and central pump computer. For this reason, every pump requires a physical interface.

Ideal for coupling several pumps: the DigiCon interface converter

The Wilo-specific protocol is simple. It is based on the current-loop principle, therefore allowing transmission over longer distances. Wilo offers the DigiCon interface converter for coupling several pumps via RS485 interface.

Module descriptions

Stratos PLR IF module

if modul dp str  lin 01 0908



  • Stratos/Stratos-D/Stratos-Z series

PLR IF module

if modul modbus  lin 01 0908



  • IP-E/DP-E series
  • IL-E/DL-E series
  • Economy MHIE series
  • Multivert MVIE series
  • Helix VE series


The Wilo DigiCon interface converter implements the PLR protocol on the proven and generally used RS485 interface. Hence, all Wilo pumps with a PLR interface are BUS-capable. Up to 4 pumps can be connected to one interface converter.

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