CIM/CIU fieldbus - control of pumps and pump systems



The Grundfos fieldbus concept is the ideal solution for complete control of pumps and pump systems. The Communication Interface Module (CIM) and the Communication Interface Unit (CIU) enable data communication via open and interoperable networks.

The Grundfos CIM/CIU communication interfaces offer ease of installation and commissioning, user-friendliness, and great value for money in the long term. All modules are based on standard functional profiles for easy integration into the network and easy understanding of data points.

CIM modules are add-on modules that allow communication with 11 to 22 kW E-pumps and the new Dedicated Controls for wastewater pumps.

The CIU communication interface unit is for products with a GENIbus interface such as small E-pumps, circulation

pumps and boosters. CIU units have an integrated 24 to 240 V power supply and are prepared for wall-mounting or DIN-rail mounting.

The CIM/CIU interfaces support the following fieldbus standards:

  • LON
  • Modbus RTU
  • BACnet MS/TP


  • CIM/CIU 100/110 LON is mainly used for HVAC applications
  • CIM/CIU 150 Profibus DP is mainly used for factory and process automation
  • CIM/CIU 200 Modbus RTU is used for versatile automation e.g. HVAC and wastewater applications
  • CIM/CIU 250 GSM is mainly used for water supply and wastewater applications
  • CIM/CIU 271 GRM is used together with Grundfos Remote Management
  • CIM/CIU 300 BACnet is used for building automation

Features and benefits

  • Based on standard functional profiles
  • Prepared for future communications standards
  • Supports a wide range of Grundfos products
  • Easy to install and commission
  • Flexible power supply


  • Easy to install and commission
  • Flexible power supply
  • Based on standard functional profiles



CIM / CIU – product brochure

GRUNDFOS CIM/CIU (Product brochure)

Communication Interfaces Complete control for pumps and pump systems

Grundfosliterature-3157095.pdf (929 KB)

Communication interface for GSM/GPRS WW

Communication interfaces for GSM/GPRS -wastewater (Data Sheet)

Communication interface for GSM/GPRS for Dedicated Controls and for sewage AUTOADAPT

Grundfosliterature-3066028.pdf (418 KB)

Communication interface for BACnet MS/TP

Communication interface for BACnet MS/TP (Data Sheet)

The CIM/CIU 300 is a standard interface for data transmission between a BACnet MS/TP network and a Grundfos pump. It makes data exchange possible between pumps and a SCADA system or supervisory controller.

Grundfosliterature-2838975.pdf (430 KB)



Information and advice

Grundfos is a world-wide provider of pumps and related systems. We have a trained staff of service engineers who will be able to support you during the installation phase of the pump or solution. Grundfos products are manufactured to very high standards, which helps to ensure a long life. Our many years of experience of different kinds of installation and with installation techniques are also key factors for maximising the lives of your Grundfos products or systems.

We will be able to support you with the following:

  • Information about the proper protection of our pumps
  • Advice on the physical positioning of the pump for necessary service/repair
  • Advice on the physical positioning of the pump to maintain proper operation
  • Correct cabling to fulfil the requirements of good practice and electromagnetic compatibility.

Please contact your local Grundfos company to obtain full support for your new installation.



Service agreement

A Grundfos service agreement ensures the efficient and uninterrupted operation of your pump system and gives you access to Grundfos service centres and authorised service partners worldwide, 24 hours a day.

Prevention is better, and more cost-effective, than cure

Once you have purchased your pump, you will want it to function efficiently and reliably; a formal service agreement with Grundfos will give you peace of mind. It also makes sound economic sense, giving you a firm costing for your maintenance budget and access to substantial discounts.

You simply combine a range of service programmes to suit your needs – and then let us carry out scheduled maintenance visits to prevent downtime. We offer three types of service agreement, available for all pumps:

  • Basic
  • Extended
  • Total.


Whichever agreement you choose, your equipment will always be serviced by specially trained staff.

The cost-effective choice

Well-maintained pumps can reduce your energy consumption by up to 50 %. Furthermore, it's worth remembering that in a series of pumps working together, one faulty pump can affect all the others. A Grundfos service agreement keeps the total cost of operating a pump to a minimum. Our careful calculation of the life-cycle cost of all our products means that we have an overview of the true costs of owning each of our pumps.

Signing up for a service agreement and letting our highly-skilled service technicians service your pumps is a safeguard against unforeseen expenditure. Regular servicing and maintenance of your pumps will ensure that they operate with optimum efficiency.




The purpose of CAPS is to provide a complete tool that contains both an extensive catalogue of Grundfos products and a sizing program to select the most suitable pump for your application.

There is also a comprehensive pump replacement selection function for central heating circulator pumps, hot water pumps and wastewater S pumps, and a function for producing professional quotations that include curves, drawings, quotation texts, wiring diagrams, etc.

Last but not least, the software contains the instruction and operating manuals for nearly all Grundfos pumps in multiple languages. Service drawings, exploded views and parts lists are available for all sewage products as well as several other pump types.

CAPS is available in two versions: WinCAPS, available on CD-ROM, and the online version WebCAPS, available at the Grundfos website. Additional features available in WebCAPS include CAD Drawings and Literature.

Spare parts

Spare parts

Sales office

Contact us

Select country to contact your local sales company


(632) 465 3000


(632) 812 8854


5548 Osmena Highway
Brgy San Isidro
PH-Makati City 1234 Makati City

Service center

Contact us

Select country to contact your local service center


(632) 465 3000


(632) 813 1548


5548 Osmena Ave., Brgy. San Isidro, Makati City